ci: run test-linux setup steps in parallel

[risu729]

Summary

• Run the independent test-linux setup steps as a GitHub Actions parallel group.
• Add a scoped actionlint ignore for ci.yml while actionlint v1.7.12 does not recognize the new parallel syntax yet.

This uses the GitHub Actions parallel steps feature announced in the changelog: https://github.blog/changelog/2026-06-25-actions-steps-can-now-be-run-in-parallel/

Validation

• mise run check --lint

Note: the commit hook was bypassed because staged-only zizmor cannot parse ci.yml with the new parallel syntax yet and exits with no inputs collected. The full repo check passes; zizmor logs the same schema warning but does not fail when the other workflows are included.

Summary by Sourcery

Run independent test-linux setup steps in the CI workflow in parallel and adjust linting configuration to accommodate the new workflow syntax.

CI:

• Group the Docker Compose preparation and Ubuntu WSL image resolution steps into a parallel block in the test-linux job of ci.yml.
• Add an actionlint configuration file to ignore temporary false positives caused by the new parallel steps syntax in ci.yml.

[sourcery-ai]

Reviewer's Guide

Updates the test-linux job in the GitHub Actions CI workflow to run two independent setup steps in parallel using the new parallel syntax, and adds a scoped actionlint configuration to ignore current false positives caused by that new syntax until the linter supports it.

Sequence diagram for parallel test-linux setup steps in CI workflow

sequenceDiagram
  participant GitHubActionsRunner
  participant PrepareDockerComposeEnvironment_step
  participant ResolveUbuntuWSLImageVersion_step
  participant CacheUbuntuWSLImage_step

  GitHubActionsRunner->>GitHubActionsRunner: start test-linux job

  par parallel_setup_steps
    GitHubActionsRunner->>PrepareDockerComposeEnvironment_step: run
    PrepareDockerComposeEnvironment_step-->>GitHubActionsRunner: export MISE_VERSION to GITHUB_ENV
  and
    GitHubActionsRunner->>ResolveUbuntuWSLImageVersion_step: run
    ResolveUbuntuWSLImageVersion_step-->>GitHubActionsRunner: set etag in wsl-image output
  end

  GitHubActionsRunner->>CacheUbuntuWSLImage_step: run using wsl-image.etag

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File-Level Changes

Change	Details	Files
Run the Docker Compose preparation and Ubuntu WSL image resolution steps in parallel within the test-linux job.	Replaces two sequential setup steps with a single - parallel: group containing both steps as array items. Keeps the existing shell logic for determining MISE_VERSION and writing it to GITHUB_ENV unchanged inside the first parallel step. Keeps the existing wsl-image step logic and id: wsl-image output handling unchanged inside the second parallel step.	.github/workflows/ci.yml
Configure actionlint to ignore known issues with the new GitHub Actions parallel steps syntax in the CI workflow.	Adds a new .github/actionlint.yaml configuration file scoping overrides to .github/workflows/ci.yml. Configures ignores for the missing run/uses step error and for the undefined wsl-image property error that actionlint v1.7.12 currently reports for the parallel syntax.	.github/actionlint.yaml

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