ci: disable pushing backend docker image

Author: iTrooz

.github/workflows/ci.yml

@@ -55,13 +55,13 @@ jobs:
         driver: docker-container
         driver-opts: image=moby/buildkit:master,network=host
 
-    - name: Build and push Docker image
+    - name: Build Docker image
       uses: docker/build-push-action@v4
       if: github.event.repository.fork == false && github.ref_name == 'main'
       with:
         context: .
         file: backend/backend.Containerfile
-        push: true
+        push: false
         cache-from: type=gha
         cache-to: type=gha,mode=max
         tags: |