fix(docker) build the latest docker image first, then tag (#351)

Author: Roger Lam

.circleci/config.yml

@@ -41,31 +41,32 @@ workflows:
               only: /.*/
             branches:
               ignore: /.*/
-      - docker-tools/tag:
-          name: tag
+      - docker-tools/build_and_push:
+          name: build_and_push_latest
           context: docker-deploy
           docker_username: ${DOCKER_USERNAME}
           docker_password: ${DOCKER_PASSWORD}
+          workspace_root: *workspace_root
           docker_image: *docker_image
+          docker_tag: latest
           filters:
             tags:
               only: /.*/
             branches:
               ignore: /.*/
-      - docker-tools/build_and_push:
-          name: build_and_push_latest
+          docker_build_args: --build-arg VERSION=${CIRCLE_TAG}
+      - docker-tools/tag:
+          name: tag
           context: docker-deploy
           docker_username: ${DOCKER_USERNAME}
           docker_password: ${DOCKER_PASSWORD}
-          workspace_root: *workspace_root
           docker_image: *docker_image
-          docker_tag: latest
+          docker_source_tag: latest
           filters:
             tags:
               only: /.*/
             branches:
               ignore: /.*/
-          docker_build_args: --build-arg VERSION=${CIRCLE_TAG}
 
 executors:
   python-tox: