fix #7: CI login-before-scan order, d-engine main, Docker badge

[JoshuaChi]

Summary by CodeRabbit

• Chores

  • Improved Docker image release automation by authenticating earlier in the build process and allowing intentional shell syntax during manifest creation.
  • Updated the engine dependency to track the main development branch.

• Documentation

  • Added a Docker Hub pull-count badge to the README.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 42249771-2ac9-40e7-bb14-f1a67ac74cbc

📥 Commits

Reviewing files that changed from the base of the PR and between 2d6e501 and 55bdf83.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• .github/workflows/docker-release.yml
• README.md
• d-lmdb/Cargo.toml

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📝 Walkthrough

Walkthrough

The PR moves Docker Hub authentication before Docker Scout scanning, adds a ShellCheck suppression for manifest creation, adds a Docker Pulls badge, and updates both d-engine dependency declarations to use the main branch.

Changes

Release and dependency maintenance

Layer / File(s)	Summary
Docker release workflow and badge updates .github/workflows/docker-release.yml, README.md	Docker Hub login now runs before the Docker Scout scan, the later duplicate login is removed, intentional manifest digest word-splitting is suppressed for ShellCheck, and a Docker Pulls badge is added.
d-engine dependency branch update d-lmdb/Cargo.toml	Both runtime and development d-engine dependencies now use the main branch while preserving their existing feature settings.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related issues

• fix(ci): docker-release CVE scan runs before Docker Hub login, fails with exit 125 #7 — Directly corresponds to moving Docker Hub login before the Docker Scout CVE scan.

Possibly related PRs

• deventlab/d-lmdb#6 — Adds the Docker Scout CVE-check gate affected by the workflow login ordering.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the three main changes: CI login order, d-engine branch update, and the Docker badge addition.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/7-docker-release

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