add action for pushing docker image

.github/workflows/push-docker-image.yml

@@ -0,0 +1,27 @@
+name: Push Docker Image
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build Docker image
+        run: |
+          docker build -t internethealthreport/ihr-website:${{ github.ref_name }} .
+
+      - name: Push Docker image
+        run: |
+          docker push internethealthreport/ihr-website:${{ github.ref_name }}