💚 Add job to push the docker image to docker hub.

.circleci/config.yml

@@ -56,6 +56,24 @@ jobs:
               echo "heroku app not responding, failing deploy" \
               exit 1; \
             fi
+  docker-build-and-push:
+    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 $DOCKER_HUB_USER_ID/devops-back-final:$CIRCLE_BUILD_NUM
+            docker tag app $DOCKER_HUB_USER_ID/devops-back-final:latest
+            docker push $DOCKER_HUB_USER_ID/devops-back-final:$CIRCLE_BUILD_NUM
+            docker push $DOCKER_HUB_USER_ID/devops-back-final:latest
 
 workflows:
   version: 2
@@ -65,3 +83,6 @@ workflows:
       - back-deploy-heroku:
           requires:
             - install
+      - docker-build-and-push:
+          requires:
+            - install