feat: add include-commit-authors input to include author info in changelogs

[mldangelo]

Adds a new action input include-commit-authors that appends commit author information to changelog entries.

Example output:

feat(vehicle)!: the_commit_message (#123) (@username)

Depends on

This PR depends on googleapis/release-please#2628. The as any type assertions here will be cleaned up once that's merged and a new release-please version is published.

Changes

• Added include-commit-authors input to action.yml
• Updated src/index.ts to pass the option through to Manifest.fromConfig()
• Added override for manifest-based configs (similar to changelogHost)

Usage

- uses: google-github-actions/release-please-action@v4
  with:
    include-commit-authors: true

Or in release-please-config.json:

{
  "include-commit-authors": true
}

Tests

• Added tests for release-type config
• Added tests for manifest config override
• All existing tests pass

---

Thanks for your work on this project! Fixes #1063. Let me know if you'd like any changes.

[ferrarimarco]

Thanks for this PR. Need to have a look at googleapis/release-please#2628 first, I guess. :)

[1zha0]

Now that, googleapis/release-please#2628 has been merged, can this PR also been reviewed and merged. @chingor13 and @ferrarimarco

[mldangelo]

Thanks for rebasing, @ferrarimarco! And thanks to @1zha0 for the nudge.

The upstream feature landed in release-please 17.5.0, so the as any casts can be cleaned up once #1199 bumps the dependency. Happy to push that cleanup after it merges, or fold it into this PR if you'd prefer — whatever's easiest.

For context, the config JSON option ("include-commit-authors": true in release-please-config.json) will work as soon as #1199 lands. This PR adds the action input so users who configure everything in their workflow YAML (without a manifest config) can use it too.