Image build is optimized.

.gitlab-ci.yml

@@ -19,13 +19,24 @@ variables:
   DOCKER_DRIVER: overlay2
   DOCKER_TLS_CERTDIR: ""
   DOCKER_DAEMON_TIMEOUT: 300
-#  DOCKER_HOST: "unix:///var/run/docker.sock"
   DOCKER_HOST: "tcp://localhost:2375"
+  #  DOCKER_HOST: "unix:///var/run/docker.sock"
   DOCKER_OPTS: "--data-root=/mnt/volume/docker-data"
   DOCKER_MEMORY: "4g"
   DOCKER_CPUS: "2"
 
+before_script:
+  - mkdir -p ~/.docker
+  - echo $DOCKER_CONFIG_JSON | base64 -d > ~/.docker/config.json
+  - echo $DOCKER_PW | docker login -u $DOCKER_USER --password-stdin
+  - docker system prune -a -f --volumes || true
+  - docker container prune -f || true
+  - docker network prune -f || true
+  - docker image prune -a -f || true
+  - docker builder prune -f || true
+
 build:
+  stage: build
   image: docker:dind
   services:
     - name: docker:dind
@@ -35,6 +46,7 @@ build:
     - docker build -t $DOCKER_REPO:flask .
 
 containerize:
+  stage: containerize
   image: docker:dind
   services:
     - docker:dind
@@ -44,6 +56,7 @@ containerize:
     - docker push $DOCKER_REPO:flask
 
 deploy:
+  stage: deploy
   image: docker:dind
   services:
     - docker:dind
@@ -62,3 +75,5 @@ deploy:
       sudo docker pull $DOCKER_REPO:flask
       sudo docker run --name flask-container -d -p 5000:5000 $DOCKER_REPO:flask
       "
+  only:
+    - master
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