Remove Docker Hub login - only need Forgejo registry

.forgejo/workflows/build.yaml

@@ -22,16 +22,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
-        with:
-          buildkitd-config-inline: |
-            [registry."docker.io"]
-              mirrors = ["docker-mirror.mcintire.me"]
-
-      - name: Log in to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Log in to container registry
         uses: docker/login-action@v3