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)

.env.example

@@ -0,0 +1,14 @@
+# Windmill Configuration
+WINDMILL_BASE_URL=http://windmill_server:8000
+WINDMILL_TOKEN=your-windmill-token-here
+WINDMILL_WORKSPACE=home
+
+# Workspace Volume (external Docker volume name)
+WORKSPACE_VOLUME=windmill-workspace-data
+
+# Git Configuration
+GIT_REMOTE_URL=https://github.com/username/repo.git
+GIT_TOKEN=your-github-pat-here
+GIT_BRANCH=main
+GIT_USER_NAME=Windmill Git Sync
+GIT_USER_EMAIL=windmill@example.com