feat: add docker build

.github/workflows/ci.yml

@@ -35,3 +35,43 @@ jobs:
 
     - name: Run tests
       run: uv run pytest
+
+  docker:
+    runs-on: ubuntu-latest
+    needs: test
+    permissions:
+      contents: read
+      packages: write
+    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    
+    - name: Extract metadata
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: ghcr.io/${{ github.repository_owner }}/cordra-mcp
+        tags: |
+          type=ref,event=branch
+          type=raw,value=latest
+    
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        push: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        cache-from: type=gha
+        cache-to: type=gha,mode=max