fix: add repository check to Docker Hub login step

Only attempt Docker Hub login when running from the main repository,
not from forks. This prevents authentication errors in forked repos
while still allowing them to build images locally.

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

.github/workflows/docker-publish.yml

@@ -33,7 +33,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log in to Docker Hub
-        if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request' && github.repository == 'BeehiveInnovations/gemini-mcp-server'
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}