Add packages input for selective package testing

[Sewer56]

Summary

Adds a packages input to allow testing specific packages instead of the entire workspace.

Problem

When using --exclude with cargo tarpaulin/workspace commands, excluded packages are still compiled as dependencies of included packages. This causes issues when packages have mutually exclusive features (e.g., async vs blocking).

Solution

New packages input accepts a multi-line list of package names:

- uses: Reloaded-Project/devops-rust-test-and-coverage@v1
  with:
    packages: |
      package-a
      package-b

When provided, the action uses -p <pkg> flags instead of --all.

Testing

• Added .github/workflows/test-packages-input.yml with a fixture workspace under tests/fixtures/packages-input-workspace
• Tests empty packages (backward compatible), single package, and multiple packages
• Exercises both cargo and cross code paths (and tarpaulin)

Backward Compatibility

When packages is empty (default), behavior is unchanged (uses --all).

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Walkthrough

Adds a new packages input to the action and wires it through action.yml as a sanitized SAFE_PACKAGES environment variable. PACKAGES_ARG is constructed from SAFE_PACKAGES and applied to cargo, cross, and tarpaulin test invocations; cache-key composition was extended to include SAFE_PACKAGES. Adds a test fixture workspace with package-a, package-b, package-c and tests that assert package-specific marker files. Adds a GitHub Actions workflow (tests/.github/workflows/test-packages-input.yml) and documents the packages input in README.md.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add packages input for selective package testing' accurately summarizes the main change: adding a new packages input feature to the action for targeted package testing.
Description check	✅ Passed	The description is well-related to the changeset, explaining the problem (--exclude compilation issues), the solution (new packages input), testing approach, and backward compatibility.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into v1-master

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/add-packages-input

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (f7d1d74) to head (f816ecd).
⚠️ Report is 2 commits behind head on v1-master.

Additional details and impacted files

@@      Coverage Diff       @@
##   v1-master   #9   +/-   ##
==============================
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