CI/CD: Automatically publish Docker image (#349)

.github/workflows/docker-image.yml

@@ -0,0 +1,28 @@
+name: Build and publish Docker image
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  publish:
+    name: Build and publish Docker image
+    runs-on: ubuntu-latest
+    steps: 
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      
+      - name: Check out repository code
+        uses: actions/checkout@v3
+ 
+      - name: Build and publish image
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          tags: |
+            ${{ secrets.DOCKER_USERNAME }}/rallly:latest
+            ${{ secrets.DOCKER_USERNAME }}/rallly:${{ github.sha }}

docker-compose.yml

@@ -15,8 +15,7 @@ services:
       retries: 5
 
   rallly:
-    build:
-      context: .
+    image: lukevella/rallly:latest
     restart: always
     depends_on:
       rallly_db: