Update pre-commit fix workflow to automatically run on GitHub Copilot PRs

[Copilot]

Problem

The pre-commit fix GitHub Action was only configured to run via manual workflow_dispatch trigger. This meant that pull requests created by GitHub Copilot (which follow the copilot/* branch naming pattern) did not automatically benefit from pre-commit hook fixes, requiring manual intervention to apply formatting and linting corrections.

Solution

Updated .github/workflows/pre-commit.yml to automatically trigger on pull requests from Copilot branches while maintaining backward compatibility with manual runs.

Key Changes

1. Added pull_request_target trigger - The workflow now triggers automatically when Copilot PRs are opened, synchronized, or reopened

2. Copilot branch detection - Added logic to identify branches matching the copilot/* pattern, ensuring the workflow only runs on Copilot-generated PRs (not on all PRs)

3. Smart checkout and push - Updated the workflow to properly check out PR head branches and push fixes back to the correct branch reference, handling both PR and manual trigger contexts

4. Conditional execution - All workflow steps now conditionally execute based on branch detection, preventing unnecessary runs on non-Copilot PRs

How It Works

• Copilot PRs: Automatically runs pre-commit hooks and pushes formatting fixes when PRs are created from copilot/* branches
• Manual runs: Continues to work as before when triggered via workflow dispatch
• Other PRs: Skips execution to avoid unnecessary resource usage and prevent interference with non-Copilot workflows

This implementation follows the same pattern used in enforce-issue-linked-pr.yml, ensuring consistency across repository workflows and improving the developer experience when working with GitHub Copilot.

Testing

The workflow has been validated for:

• ✅ YAML syntax correctness
• ✅ Proper conditional logic structure
• ✅ Backward compatibility with existing workflow_dispatch trigger
• ✅ Correct branch reference handling for both PR and manual contexts

Original prompt

Please update the Pre-commit fix GitHub action to work on pull requests from copilot

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[coderabbitai]

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