Update docker/build-push-action action to v6

.gitea/workflows/build-container.yaml

@@ -42,7 +42,7 @@ jobs:
       uses: docker/setup-buildx-action@v3
 
     - name: Build and push
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: .
         # use the current commit SHA as the tag

main.py

@@ -1,6 +0,0 @@
-def main():
-    print("Hello from dns!")
-
-
-if __name__ == "__main__":
-    main()