ci: disable GHA cache on Gitea runners

Co-authored-by: multica-agent <github@multica.ai>

.github/workflows/docker-publish.yml

@@ -24,6 +24,8 @@ jobs:
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
+        with:
+          cache-image: ${{ github.server_url == 'https://github.com' }}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -58,6 +60,6 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-from: ${{ github.server_url == 'https://github.com' && 'type=gha' || '' }}
+          cache-to: ${{ github.server_url == 'https://github.com' && 'type=gha,mode=max' || '' }}
           platforms: linux/amd64,linux/arm64