Add MIT License and Docker build validation script

- Add MIT License with William Ballou as copyright holder
- Create scripts/validate_docker_build.sh for testing Docker builds independently
- Update documentation to reflect API-based secret configuration model
- Refactor sync.py to accept config via function parameters instead of env vars
- Update server.py to parse JSON payloads and validate required fields
- Improve security by removing secrets from environment variables

scripts/validate_docker_build.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+# Script to validate Docker build without requiring full Windmill docker-compose setup
+
+set -e
+
+echo "=== Validating Docker Build for Windmill Git Sync ==="
+echo ""
+
+# Build the Docker image
+echo "Building Docker image..."
+docker build -t windmill-git-sync:test .
+
+echo ""
+echo "=== Build Status ==="
+if [ $? -eq 0 ]; then
+    echo "✓ Docker image built successfully"
+
+    # Show image details
+    echo ""
+    echo "=== Image Details ==="
+    docker images windmill-git-sync:test --format "table {{.Repository}}\t{{.Tag}}\t{{.Size}}\t{{.CreatedAt}}"
+
+    # Verify Python dependencies are installed
+    echo ""
+    echo "=== Verifying Python Dependencies ==="
+    docker run --rm windmill-git-sync:test pip list | grep -E "(Flask|GitPython|requests|python-dotenv)"
+
+    # Verify wmill CLI is installed
+    echo ""
+    echo "=== Verifying wmill CLI ==="
+    docker run --rm windmill-git-sync:test wmill --version
+
+    # Verify Git is installed
+    echo ""
+    echo "=== Verifying Git ==="
+    docker run --rm windmill-git-sync:test git --version
+
+    echo ""
+    echo "=== Validation Complete ==="
+    echo "✓ All checks passed"
+    echo ""
+    echo "To clean up the test image, run:"
+    echo "  docker rmi windmill-git-sync:test"
+else
+    echo "✗ Docker build failed"
+    exit 1
+fi