👷 docker build

.circleci/config.yml

@@ -92,6 +92,26 @@ jobs: # A basic unit of work in a run
         - run:
             name: Heroku Deploy
             command: git push https://heroku:$HEROKU_API_KEY@git.heroku.com/$HEROKU_APP_NAME.git main
+
+  docker_build_push:
+    working_directory: /dockerapp
+    docker:
+      - image: docker:17.05.0-ce-git
+    steps:
+      - checkout
+      - setup_remote_docker
+      - run:
+          name: Build application Docker image
+          command: |
+            docker build --cache-from=app -t app .
+      - deploy:
+          name: Publish application to docker hub
+          command: |
+            docker login -e $DOCKER_HUB_EMAIL -u $DOCKER_HUB_USER_ID -p $DOCKER_HUB_PWD
+            docker tag app $DOCKER_HUB_USER_ID/my-awesome-ci-expr:$CIRCLE_BUILD_NUM
+            docker tag app $DOCKER_HUB_USER_ID/my-awesome-ci-expr:latest
+            docker push $DOCKER_HUB_USER_ID/my-awesome-ci-expr:$CIRCLE_BUILD_NUM
+            docker push $DOCKER_HUB_USER_ID/my-awesome-ci-expr:latest  
           
 workflows: 
   version: 2
@@ -102,5 +122,8 @@ workflows:
       #     requires:
       #       - build
       - heroku:
+          requires:
+            - build
+      - docker_build_push:
           requires:
             - build