build docker image

.gitlab-ci.yml

 image: node:carbon
 
+stages:
+  - test
+  - build
+  - pack
+
 cache:
   paths:
     - node_modules/
@@ -17,14 +22,22 @@ lint-css:
   script:
     - yarn lint:css
 
-pages:
-  stage: deploy
+build:
+  stage: build
   script:
+    - rm -rf build || true
     - yarn build:app
-    - rm -rf public
-    - mv build public
   artifacts:
     paths:
-     - public
-  only:
-    - master
+     - build
+
+docker-image:
+  stage: pack
+  image: docker:latest
+  services:
+    - docker:dind
+  script:
+    - export DOCKER_HOST="tcp://0.0.0.0:2375"
+    - docker build -t "$CI_REGISTRY_IMAGE:$CI_BUILD_REF_SLUG" .
+    - docker login -u gitlab-ci-token -p "$CI_BUILD_TOKEN" "$CI_REGISTRY"
+    - docker push "$CI_REGISTRY_IMAGE:$CI_BUILD_REF_SLUG"