Add step to push Docker image to Dockerhub

Author: DuyLongArt

.github/workflows/docker-image.yml

@@ -16,3 +16,7 @@ jobs:
     - uses: actions/checkout@v4
     - name: Build the Docker image
       run: docker build . --file Dockerfile --tag duylongcontainer/ui:$(date +%s)
+
+
+    - name: Push to Dockerhub
+      run: docker push duylongcontainer/ui:$(date +%s)