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)

Dockerfile

@@ -0,0 +1,29 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install wmill CLI
+RUN curl -L https://github.com/windmill-labs/windmill/releases/latest/download/wmill-linux-amd64 -o /usr/local/bin/wmill \
+    && chmod +x /usr/local/bin/wmill
+
+# Copy requirements and install Python dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY app/ ./app/
+
+# Create workspace directory
+RUN mkdir -p /workspace
+
+# Expose port for webhook server
+EXPOSE 8080
+
+# Run the Flask server
+CMD ["python", "-u", "app/server.py"]