ci: build and publish docker image

.github/workflows/ci.yml

@@ -3,6 +3,7 @@ name: CI
 on: [push, pull_request]
 
 env:
+  IMAGE: ${{ github.repository }}
   VERSION: ${{ github.sha }}
 
 jobs:
@@ -27,6 +28,14 @@ jobs:
         name: dist
         path: dist
 
+    - name: Build docker image
+      run: docker build -t $IMAGE:$VERSION -f docker/Dockerfile .
+
+    - name: Push docker image
+      run: |
+        docker login -u ${{ secrets.DOCKER_HUB_USERNAME }} -p ${{ secrets.DOCKER_HUB_PASSWORD }}
+        docker push $IMAGE:$VERSION
+
   preview:
     runs-on: ubuntu-latest
     needs: build
@@ -62,3 +71,15 @@ jobs:
           NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
         with:
           args: deploy --dir=. --prod
+
+  publish_docker_image:
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.ref == 'refs/heads/master'
+    steps:
+      - name: Push latest
+        run: |
+          docker pull $IMAGE:$VERSION
+          docker tag $IMAGE:$VERSION $IMAGE:latest
+          docker login -u ${{ secrets.DOCKER_HUB_USERNAME }} -p ${{ secrets.DOCKER_HUB_PASSWORD }}
+          docker push $IMAGE:latest