Refactors the release_homebrew action to improve tap handling, commit logic, and GitHub Actions log grouping. Adds robust tap name parsing, explicit commit steps for formula changes, and more granular test-bot steps. Updates tests and fixtures for better coverage, including tap naming edge cases, environment setup, and cleanup. Introduces .gitattributes for consistent line endings and improves CI workflow reliability, especially on macOS.

Refactored the action and main script to allow specifying custom head and base branches for both the org homebrew repo and homebrew-core fork when creating pull requests. Updated documentation and input parameters to reflect these changes. Enhanced test coverage to validate the new branch handling logic.

Enhanced the test_process_input_formula_copy_failure test by mocking os.makedirs and shutil.copy2 to simulate directory creation and file copying. This ensures the test accurately simulates a copy failure scenario without performing actual file operations.

Updated the release_homebrew action to generate commit messages based on whether a formula is new or updated, and to include the version number when available. The commit message is now set as an output and used in subsequent commit and pull request steps, replacing the previous static message format.

Introduces a new input, skip_stable_version_audit, to the release_homebrew action to optionally skip the stable version audit in brew test-bot runs. Updates the README, action.yml, and main.py to support this feature, and sets the default to true for easier PR testing. Minor whitespace fixes in test_release_homebrew.py.

Introduces the Homebrew/actions/setup-homebrew action for consistent Homebrew environment setup. Removes manual PATH configuration and streamlines the Homebrew test step.

Adds the HOMEBREW_BOTTLE_BUILD environment variable when running the Homebrew test bot to allow skipping advanced tests during bottle builds. This change ensures the subprocess inherits the current environment and sets the required variable.