add step to deploy docker image to droplet

.github/workflows/deploy.yml

@@ -27,3 +27,19 @@ jobs:
         with:
           push: true
           tags: ${{ secrets.DOCKER_USERNAME}}/${{ secrets.DOCKER_REPOSITORY }}:latest
+
+      - name: Deploy to DO
+        uses: appleboy/ssh-action@v1.0.3
+        env:
+          IMAGE_PATH: ${{ secrets.DOCKER_USERNAME }}/${{ secrets.DOCKER_REPOSITORY }}:latest
+          APP_NAME: ${{ secrets.DOCKER_REPOSITORY }}
+          PORT: ${{ secrets.PORT }}
+        with:
+          host: ${{ secrets.DO_HOST }}
+          username: ${{ secrets.DO_USERNAME }}
+          key: ${{ secrets.DO_KEY }}
+          script: |
+            docker image pull $IMAGE_PATH
+            docker container stop $APP_NAME
+            docker container rm $APP_NAME
+            docker container run -d --name $APP_NAME -p $PORT:$PORT $IMAGE_PATH