Add Publish DockerHub image action

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+# @link https://itsmetommy.com/2021/07/05/push-to-docker-hub-using-github-actions/
+name: Publish DockerHub image
+
+on:
+  # run it on push to the default repository branch
+  push:
+    branches:
+      - 'master'
+    #tags:
+    #  - 'latest'
+  pull_request:
+    branches:
+      - 'master'
+
+jobs:
+  build-container:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: rosariosis/rosariosis
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}