Add github action workflow

.github/workflows/docker-image.yml

@@ -0,0 +1,48 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      -
+        name: Checkout 
+        uses: actions/checkout@v2
+      -
+        name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Build and export to Docker
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: ./backend/Dockerfile.prod
+          load: true
+          tags: webmultimedia/http-streaming-server:master
+      -
+        name: Test
+        run: |
+          docker-compose -f docker-compose-prod.yml run --rm web ./wait-for-it.sh db:5432 -- python3 manage.py test
+      -
+        name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: ./backend/Dockerfile.prod
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: webmultimedia/http-streaming-server:master