fix: Add PAT authentication to Docker workflow for README updates

- Enables Docker workflow to push README updates after image publish
- Uses PAT token instead of GITHUB_TOKEN for repository write permissions
- Completes automation flow: PR merge → version bump → Docker build → README update

🤖 Generated with Claude Code

.github/workflows/build_and_publish_docker.yml

@@ -22,6 +22,8 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4
+      with:
+        token: ${{ secrets.PAT }}
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3