Automatically push Docker image to Docker Hub (#3)

.github/workflows/dockerhub.yml

@@ -0,0 +1,25 @@
+name: Push to DockerHub
+
+on:
+  push:
+    branches: [master]
+
+jobs:
+  dockerhub:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - uses: satackey/[email protected]
+
+      - name: Build and push Docker images
+        uses: docker/[email protected]
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          repository: ${{ github.event.repository.full_name }}
+          tag_with_sha: true
+          tags: latest
+          dockerfile: Dockerfile