Update .gitlab-ci.yml

.gitlab-ci.yml

 # This file is a template, and might need editing before it works on your project.
 docker-build-master:
   # Official docker image.
-  image: zhicwu/pdi-ce:latest
+  image: docker:latest
   stage: build
-
+  services:
+    - docker:dind
+  before_script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+  script:
+    - docker build --pull -t "$CI_REGISTRY_IMAGE" .
+    - docker push "$CI_REGISTRY_IMAGE"
+  only:
+    - master
 
 docker-build:
   # Official docker image.
-  image:  zhicwu/pdi-ce:latest
+  image: docker:latest
   stage: build
   services:
     - docker:dind
+  before_script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+  script:
+    - docker build --pull -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" .
+    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
+  except:
+    - master