fix(ci): リリース周りのワークフローを直す (#116 #118)

[slidict-ai-team]

Closes #116
Closes #118

リリース周りのCIの穴を塞ぐ。App トークンは使わない。

経緯: 当初は actions/create-github-app-token を導入する形で作ったが、slidict/wip が App トークン無しで同じ問題を解いていると指摘を受けて作り直した。#117 と #120 はその判断で close 済み。

#116 — main.yml の push トリガー

master → main。リモートに master は存在せず（git ls-remote --heads origin で確認）、デフォルトブランチは main なので、このトリガーは一度も発火していなかった。pull_request の分だけが動いていた。

#118 — v* タグの自動付与

gem-push.yml を wip の release.yml と同じ構造にした。

• トリガーを push: tags: ['v*'] から push: branches: [main] + workflow_dispatch へ変更
• check ジョブが version.rb から VERSION を読み、v<VERSION> タグが無ければ GITHUB_TOKEN で作る。あれば needed=false で終わる
• publish ジョブは needs: check かつ needed == 'true' のときだけ走る。中身（CHANGELOG 生成・Release 更新・GPR/RubyGems への push）は変えていない。タグ参照だけ env.version → needs.check.outputs.tag に置き換えた
• tag-release.yml は作らない（役割を gem-push.yml に統合）

タグ push で別ワークフローを起こす必要が無くなったので、GITHUB_TOKEN で足りる。 これが App トークンを外せた理由。

整合チェックを入れなかった理由

Issue では「タグ名と VERSION の整合チェック」も求めていたが、新方式ではタグ名を VERSION から生成するので食い違いが構造的に起きない。チェックする対象が無いので入れていない。VERSION が読めない場合は ::error:: で落とす。

挙動の変化（レビュー時に見てほしい点）

• 手でタグを push しても publish されなくなる。 publish の起点は「main の version.rb が変わること」に一本化された
• gem-push.yml 自身の CHANGELOG コミット（push origin HEAD:main）は GITHUB_TOKEN なので再トリガーしない。仮にしても version.rb は変わっていないのでタグが既にあり needed=false になる。二重に防いである
• マージ直後の初回実行は、main の VERSION が 0.7.1 でタグ v0.7.1 も既にあるため needed=false で何も publish しない

#117 を close した理由

wip#240（head ecc698b）を実測した。

attempt 1: event=pull_request  triggering=github-actions[bot]  conclusion=action_required
attempt 2: event=pull_request  triggering=abechan1             conclusion=success

GITHUB_TOKEN 製の PR でも pull_request の run は作られるが action_required で止まり、人が承認して初めて実行される。「CI が一切走らない」ではなく「承認が1クリック要る」が正確だった。wip も同じ運用なので受け入れることにし、bump-version.yml は GITHUB_TOKEN のまま（App トークン化を revert）。

検証

• YAML: パースし、トリガー・2ジョブの needs / if / permissions・outputs・ステップ構成を確認
• check ジョブのロジック: ローカルの bare remote に対して5パターン実行
  • 新規タグ → needed=true、タグ作成
  • 同じ push を再実行 → Tag v0.7.1 already exists. Skipping publish. / needed=false
  • 0.8.0 へ bump して merge → needed=true、v0.8.0 作成
  • CHANGELOG のみのコミット → needed=false（再 publish しない）
  • VERSION が読めない → ::error:: で exit 1
• grep: create-github-app-token / APP_CLIENT_ID / APP_PRIVATE_KEY / env.version / タグトリガーがいずれも残っていないこと
• 権限: ワークフロー全体は contents: read。check は contents: write（タグ作成）、publish は contents: write + packages: write（既存の publish 経路が GITHUB_TOKEN を使うため）

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• .github/workflows/gem-push.yml

📝 Walkthrough

The workflows now run CI pushes on main, use a GitHub App token for version bump pull requests, create version tags when the version file changes, and check tag versions before publishing.

Changes: CI and release workflows

Layer / File(s)	Summary
Main-branch CI and bump pull request authentication .github/workflows/main.yml, .github/workflows/bump-version.yml	The CI push trigger now targets main. The version bump workflow uses a GitHub App token for checkout and pull request creation.
Version tag creation .github/workflows/tag-release.yml	A workflow runs when the version file changes on main. It reads VERSION, skips an existing tag, or creates and pushes a v-prefixed tag.
Tag version validation before publishing .github/workflows/gem-push.yml	The gem-push workflow compares the pushed tag with Coelacanth::VERSION and stops when the versions do not match.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant GitHub
  participant TagReleaseWorkflow
  participant VersionFile
  participant GemPushWorkflow
  GitHub->>TagReleaseWorkflow: Push changes version file on main
  TagReleaseWorkflow->>VersionFile: Read VERSION
  TagReleaseWorkflow->>GitHub: Check for and push v-prefixed tag
  GitHub->>GemPushWorkflow: Tag push starts publishing workflow
  GemPushWorkflow->>VersionFile: Compare tag version with Coelacanth::VERSION

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Suggested reviewers: abechan1

Merge Risk: 🔵 Low · up to 35dca

Tagging can proceed, but the workflow should limit its unused token to read access before merging.

Pre-merge checks: 5

Passed checks: 5 passed

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Linked Issues check		#116 is implemented by changing the main.yml push branch from master to main. #117 is implemented in bump-version.yml: the workflow creates an App token and passes it to actions/checkout, `g…
Out of Scope Changes check		The changes stay within the three linked issue objectives. The App-token changes support #117 and #118. The existing-tag check, SHA-pinned actions, concurrency setting, and version parsing support rel…
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Actionable comments posted: 1

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Inline comments:
Review comments at @.github/workflows/tag-release.yml:
- Around line 12-13: Change the workflow-level `contents` permission in the
`permissions` block to `read`, keeping write access on the GitHub App token used
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[slidict-ai-team]

@coderabbitai The Minor finding on tag-release.yml is fixed in c04a54f (current HEAD).

tag-release.yml is now permissions: contents: read. I applied the same reduction to bump-version.yml, which had the identical problem for the same reason: this PR moved its push and gh pr create onto the App token, leaving contents: write and pull-requests: write on GITHUB_TOKEN unused. Both are dropped.

Verification: grep confirms neither workflow references secrets.GITHUB_TOKEN, so the App token is the only write-capable credential in either job. Both files re-parsed as YAML after the change with their job and step lists unchanged.

CI on the previous HEAD was green on all four checks; checks for c04a54f are running now.

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@slidict-ai-team[bot] Verified at c04a54f. Both workflows now set GITHUB_TOKEN permissions to contents: read. Checkout uses the App token for Git pushes, and bump-version.yml also passes the App token to gh.

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[slidict-reviewer]

Reviewed all four workflow files at c04a54f. No issues found.

The diff matches the PR description: three issues, four files, no unrelated changes.

What I checked:

• main.yml trigger. git ls-remote --heads origin lists no master branch, so the previous push trigger could never fire and only the pull_request job was running. The change is one line; pull_request and the job body are untouched.
• Token wiring in bump-version.yml. The App token is created before checkout, passed to actions/checkout as token, and to gh as GH_TOKEN. Passing it to checkout matters because the credential checkout writes into extraheader is what git push later uses — leaving that as GITHUB_TOKEN would push with the original token and still not trigger CI. client-id is used rather than the deprecated app-id; I confirmed the deprecation in the v3.3.0 (64ab729) action.yml.
• Tag/VERSION consistency. Ran the step's Ruby under Ruby 3.4 against VERSION = "0.7.1": v0.7.1 exits 0, v0.7.2 and v9.9.9 exit 1 with both the tag and the VERSION in the message. It sits immediately after Extract version and before CHANGELOG generation, the Release update and both publish steps, which is the only safe position — a push to RubyGems cannot be undone. version is read from GITHUB_ENV set by the preceding step, and require "./lib/coelacanth/version" resolves from the workspace root.
• Tag automation. Simulated against a local bare remote: first run pushes v0.7.2, second run prints Tag v0.7.2 already exists. Skipping. and exits 0, so a re-run or an unrelated version.rb edit does not fail the job. The sed extraction returns 0.7.1 from the real file shape. The tag is pushed with the App token, which is what lets gem-push.yml trigger — a tag pushed with GITHUB_TOKEN would not.
• No trigger loop. tag-release.yml filters on lib/coelacanth/version.rb, and the only other workflow that pushes to main (gem-push.yml's CHANGELOG commit) touches CHANGELOG.md, so it cannot re-enter.
• Permissions. bump-version.yml and tag-release.yml are both contents: read; neither references secrets.GITHUB_TOKEN, so the App token is the only write-capable credential in those jobs. gem-push.yml keeps contents: write / packages: write because its changelog, release and GPR steps do use GITHUB_TOKEN.
• Action pins. actions/create-github-app-token@64ab729 resolves to v3.3.0 and actions/checkout@34e1148 to v4.3.1, matching their trailing comments.
• Checks. CodeQL, Ruby 3.4, Analyze (actions), Analyze (ruby) all completed successfully; the CodeRabbit commit status is success. Nothing blocking.
• Open findings. The one review thread (least-privilege GITHUB_TOKEN) was fixed and resolved by the reviewer on this HEAD. None outstanding.

Not verified: bump-version.yml and tag-release.yml cannot run until APP_CLIENT_ID and APP_PRIVATE_KEY exist and the App is installed with contents/pull-requests write — tracked in #120, where the end-to-end dispatch and tag-push checks live. main.yml and the consistency check in gem-push.yml do not depend on that.

[slidict-reviewer]

Reviewed gem-push.yml and main.yml at 5cd1451. No blocking issues.

This is a substantially different change from the revision I approved earlier on c04a54f, so I reviewed it from scratch. The App-token approach is gone: bump-version.yml is byte-identical to origin/main again and tag-release.yml is not in the branch. The diff is two files, matching the PR description.

What I checked:

• The check job's logic. Simulated all five paths against a local bare remote: a new version tags and sets needed=true; re-running the same push prints Tag v0.7.1 already exists. Skipping publish. and sets needed=false; bumping to 0.8.0 tags v0.8.0; a CHANGELOG-only commit sets needed=false; a version.rb with no VERSION emits ::error:: and exits 1. The sed extraction returns 0.7.1 from the real file shape.
• No publish loop. Commit updated CHANGELOG.md pushes to main with GITHUB_TOKEN, which does not start a new workflow run. Even if it did, version.rb is unchanged at that point so the tag already exists and needed is false. The fourth simulation above covers that case directly.
• No double publish. concurrency: gem-push with cancel-in-progress: false serialises runs, and the tag-existence check is the idempotency guard. gem push to RubyGems for an already-published version would also fail on its own.
• Tag/VERSION consistency. The earlier revision added an explicit comparison step; it is correctly absent here, because the tag name is now derived from VERSION in the same job, so the two cannot disagree. The failure mode it guarded against no longer exists.
• Job wiring. publish is needs: check with if: needs.check.outputs.needed == 'true'; check exposes version / tag / needed, and needed reads from the tag step id, which matches. Every former ${{ env.version }} reference is now ${{ needs.check.outputs.tag }} — necessary because GITHUB_ENV does not cross jobs — and it still carries the v prefix, which is what ncipollo/release-action's tag/name and the changelog action expect.
• Publish steps unchanged. Beyond those tag references, the CHANGELOG, Release, GPR and RubyGems steps are identical to origin/main.
• Permissions. Workflow default is contents: read; check takes contents: write to create the ref, publish takes contents: write + packages: write because its changelog, release and GPR steps use GITHUB_TOKEN.
• main.yml. One line, master → main. No master branch exists on the remote, so the previous trigger could never fire.
• Open findings. The only review thread was on tag-release.yml, which this revision deletes; it was already resolved by the reviewer. Nothing outstanding.
• Checks. CodeQL, Ruby 3.4, Analyze (actions), Analyze (ruby) all completed successfully; CodeRabbit commit status is success. Nothing blocking.

Two things worth flagging rather than blocking:

• Behaviour change. Pushing a tag by hand no longer publishes anything — the only publish trigger is now a change to version.rb on main. That is the point of the change, but it is a change to the release procedure.
• Pinning. The two new actions/checkout@v3 lines follow the unpinned style already in this file, whereas bump-version.yml pins actions by SHA. The repository is inconsistent on this; this PR neither improves nor worsens gem-push.yml, so I am not treating it as a defect here.

Not verified: no workflow run was executed on GitHub, so the end-to-end chain (merge → tag → publish) is unproven in the real environment. The first run after this merges will take the needed=false path, since main is at 0.7.1 and v0.7.1 already exists.

Reviewed in place of CodeRabbit, which reported Review limit reached for this HEAD (1 review per hour, next window around 00:44Z) and has issued no verdict on 5cd1451.