update docker-image actions

PUSH するようにしてみた

Author: ytabuchi

.github/workflows/docker-image.yml

@@ -14,5 +14,15 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+
+    - name: Log in to Docker Hub
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+    
     - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag my-image-name:$(date +%s)
+      run: docker build . --file Dockerfile --tag ${{ vars.DOCKERHUB_IMAGE_TAG }}
+      
+    - name: Push the Docker image
+      run: docker push ${{ vars.DOCKERHUB_IMAGE_TAG }}