build script for different branches

.gitlab-ci.yml

@@ -1,10 +1,36 @@
-build:
+stages:
+  - build
+  - push
+
+before_script:
+  - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+
+Build:
+  stage: build
   image: docker:latest
   script:
   - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
-  - docker build --pull -t $CI_REGISTRY_IMAGE .
-  - docker push $CI_REGISTRY_IMAGE
+  - docker build --pull -t $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA .
+  - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
   services:
   - docker:dind
   tags:
   - docker
+
+Push master:
+  stage: push
+  only:
+    - master
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:latest
+    - docker push $CI_REGISTRY_IMAGE:latest
+
+Push others:
+  stage: push
+  except:
+    - master
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME