fix: Docker workflow should only build on push to main, not PRs

- Remove pull_request trigger from Docker build workflow
- Add dockerfile path to fix build error
- Update conditional logic for login and push steps

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/mcp-server-docker.yml

@@ -6,11 +6,6 @@ on:
       - "mcp_server/pyproject.toml"
     branches:
       - main
-  pull_request:
-    paths:
-      - "mcp_server/pyproject.toml"
-    branches:
-      - main
   workflow_dispatch:
     inputs:
       push_image:
@@ -41,7 +36,7 @@ jobs:
           echo "version=$VERSION" >> $GITHUB_OUTPUT
           echo "tag=v$VERSION" >> $GITHUB_OUTPUT
       - name: Log in to Docker Hub
-        if: github.event_name != 'pull_request' && (github.event_name != 'workflow_dispatch' || inputs.push_image)
+        if: github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && inputs.push_image)
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
@@ -58,7 +53,6 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
             type=ref,event=branch
-            type=ref,event=pr
             type=raw,value=${{ steps.version.outputs.tag }}
             type=raw,value=latest,enable={{is_default_branch}}
 
@@ -67,7 +61,8 @@ jobs:
         with:
           project: v9jv1mlpwc
           context: ./mcp_server
+          file: ./mcp_server/docker/Dockerfile
           platforms: linux/amd64,linux/arm64
-          push: ${{ github.event_name != 'pull_request' && (github.event_name != 'workflow_dispatch' || inputs.push_image) }}
+          push: ${{ github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && inputs.push_image) }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}