Fix no-commit-to-branch hook failure in CI when merging pull requests

[azriel1rf]

This pull request addresses an issue where the no-commit-to-branch pre-commit hook unexpectedly fails in the GitHub Actions when merging a pull request to specific branches that has already passed CI checks.
https://github.com/HenryRLee/PokerHandEvaluator/actions/runs/8957810302

The root cause is that the no-commit-to-branch pre-commit hook is designed to prevent direct commits to protected branches by developers. However, when the GitHub Actions runs on a pull request merge commit, it also triggers all the pre-commit hooks, including no-commit-to-branch.

To resolve this, we can skip the no-commit-to-branch hook in the GitHub Actions workflow by setting the environment variable SKIP=no-commit-to-branch. This change has been tested in a forked repository and successfully allows the merge to proceed.

Please review and merge this pull request to fix the unexpected behavior of the no-commit-to-branch hook during merges in the CI environment.

[HenryRLee]

Looks good! Thanks for fixing it!