feat: Add GitOps command support for tags in GitLab

[zakisk]

This commit introduces the ability to trigger, retest, and cancel pipeline runs on GitLab tags using GitOps comments on commits.

Key features:

• Support /test tag:<tagname>, /retest tag:<tagname>, and /cancel tag:<tagname> GitOps comments on commits
• Validate that the commented commit matches the tag before processing the request
• Enable retriggering pipelines on existing tagged commits without creating new tags

Testing:

• Add comprehensive unit tests covering success and error scenarios
• Add end-to-end test validating the complete workflow from tag creation to pipeline execution

Use cases:

• Release management: retrigger pipelines on tagged releases
• Troubleshooting: re-run failed pipelines on existing tags
• Flexible CI/CD workflows for version-specific builds

📝 Description of the Change

👨🏻‍ Linked Jira

https://issues.redhat.com/browse/SRVKP-8612

🔗 Linked GitHub Issue

Fixes #

🚀 Type of Change

• 🐛 Bug fix (fix:)
• ✨ New feature (feat:)
• 💥 Breaking change (feat!:, fix!:)
• 📚 Documentation update (docs:)
• ⚙️ Chore (chore:)
• 💅 Refactor (refactor:)
• 🔧 Enhancement (enhance:)
• 📦 Dependency update (deps:)

🧪 Testing Strategy

• Unit tests
• Integration tests
• End-to-end tests
• Manual testing
• Not Applicable

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✅ Submitter Checklist

• 📝 My commit messages are clear, informative, and follow the project's How to write a git commit message guide. The Gitlint linter ensures in CI it's properly validated
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[gemini-code-assist]

Summary of Changes

Hello @zakisk, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly extends the GitOps capabilities for GitLab users by enabling pipeline control directly through comments on tagged commits. This feature provides greater flexibility for managing releases, re-running builds for specific versions, and troubleshooting issues on immutable tagged states, streamlining CI/CD workflows for version-specific operations.

Highlights

• GitOps Command Support for GitLab Tags: Introduced the ability to use GitOps comments like /test tag:<tagname>, /retest tag:<tagname>, and /cancel tag:<tagname> to trigger, retest, or cancel pipeline runs directly on GitLab tags.
• Commit-Tag Validation: Implemented validation to ensure that the commit on which a GitOps comment is made matches the commit ID of the specified tag, preventing unintended pipeline executions.
• Enhanced Testing: Added comprehensive unit tests for various success and error scenarios related to tag-based GitOps commands, along with a new end-to-end test to validate the complete workflow from tag creation to pipeline execution.

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[gemini-code-assist]

Code Review

This pull request introduces a valuable feature by adding GitOps command support for GitLab tags. The implementation is well-structured and includes comprehensive unit and end-to-end tests. My review focuses on improving code clarity and test reliability. I've identified a potentially problematic removal of e2e build tags, a redundant cleanup call in a test, and an outdated code comment. Addressing these points will enhance the overall quality and maintainability of the changes.

[zakisk]

/test

[pipelines-as-code]

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