Initial commit: Windmill Git Sync service

Add containerized service for syncing Windmill workspaces to Git repositories.

Features:
- Flask webhook server for triggering syncs from Windmill
- wmill CLI integration for pulling workspace content
- Automated Git commits and push to remote repository
- Network-isolated (only accessible within Docker network)
- Designed to integrate with existing Windmill docker-compose files

Key components:
- Docker container with Python 3.11, wmill CLI, Git, and Flask
- Sync engine with error handling and logging
- External volume support for persistent workspace data
- Comprehensive documentation (README.md and CLAUDE.md)

.gitignore

@@ -0,0 +1,37 @@
+# Environment variables
+.env
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Logs
+*.log
+
+# Docker
+.dockerignore