ci: run PR workflows on top of any branch

[mangelajo]

This makes sure that PRs depending on ohter PRs are still running all the CI jobs. Otherwise some of the workflows don't run on that type of PR which base is just another branch from another PR.

Summary by CodeRabbit

• Chores
  • Expanded GitHub Actions workflow triggers to execute on pull requests across all branches instead of main and release-* only, improving test coverage and validation throughout the development process.

[coderabbitai]

📝 Walkthrough

Walkthrough

Branch-based filtering removed from pull_request triggers across six GitHub Actions workflows, allowing CI workflows to be triggered by pull requests from any branch instead of only main and release-* branches.

Changes

Cohort / File(s)	Summary
Workflow PR Trigger Expansion .github/workflows/build-images.yaml, .github/workflows/controller-bundle.yaml, .github/workflows/controller-kind.yaml, .github/workflows/controller-tests.yaml, .github/workflows/e2e.yaml, .github/workflows/lint.yaml	Removed branch-based filtering (main and release-*) from pull_request triggers across all workflows. Path-based and other filtering mechanisms remain unchanged; workflows now respond to PRs from any branch.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• ci: build expirable images for pull-requests #167: Modifies the build-images workflow pull_request trigger handling to add PR-specific build and tag logic.
• Consider adding spec flag for lease release instead of relying on RPC-only status #489: Adjusts GitHub Actions workflow trigger branch filters across multiple workflow YAMLs including e2e and other CI configurations.

Suggested reviewers

• NickCao
• bennyz

Poem

🐰 Branches once gated, now run free,
Any PR now triggers with glee,
CI gates expanded, tests bloom wide,
From feature branches with pride! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: removing branch filters from pull request workflows to allow them to run on any branch base.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ 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 enable-pr-on-pr-ci

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[evakhoni]

I wonder, why do we even run pytest-matrix and e2e against this PR?

[mangelajo]

I wonder, why do we even run pytest-matrix and e2e against this PR?

pytest will stop running after we merge the other PR :)

e2e runs because we are modifying - '.github/workflows/e2e.yaml'

[evakhoni]

e2e runs because we are modifying - '.github/workflows/e2e.yaml'

ah so it's testing changes to it's own ci definitions huh?

pytest will stop running after we merge the other PR :)

ok nice!

[evakhoni]

lgtm

[mangelajo]

Thank you :D