Update GitHub Actions workflow for Docker deployment

The workflow in the .github/workflows/deploy-container.yaml file has been updated to use more recent actions versions and to set up Docker Buildx before logging in to Docker Hub. The secrets used for Docker Hub authentication have been renamed to 'DOCKERHUB_USERNAME' and 'DOCKERHUB_TOKEN' respectively. The Docker build and push action now uses version 5 and the tag for the Docker image has been changed to 'user/portfolio:latest'.

.github/workflows/deploy-container.yaml

@@ -10,17 +10,20 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4.1.4
 
-      - name: Log in to Docker Hub
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_TOKEN }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v2
+      - name: Build and push
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: true
-          tags: portfolio:latest
+          tags: user/portfolio:latest