Update Gitea Actions runner to use catthehacker/ubuntu images which
are specifically designed for GitHub Actions/Gitea Actions and include
Docker CLI and common tools pre-installed.
Changes:
- Replace node:20-bullseye labels with catthehacker/ubuntu:act-latest
- Add ubuntu-22.04 label pointing to act-22.04 image
- Configure DOCKER_* environment variables to be passed to jobs
These images are the standard for act (local GitHub Actions runner)
and Gitea Actions, providing better compatibility with workflows
that need Docker access.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>