Merge branch 'ci' into 'master'

Review ci for gitlab releases

See merge request sed-lille/code-elevator!2

.gitlab-ci.yml

@@ -13,27 +13,44 @@ stages:
   # - deploy
 
 variables:
-  CONTAINER_TEST_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+  CONTAINER_TEST_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
   CONTAINER_RELEASE_IMAGE: $CI_REGISTRY_IMAGE:latest
+  CONTAINER_STABLE_RELEASE_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
 
 before_script:
-  - docker login -u $CI_REGISTRY_USER -p $CI_JOB_TOKEN $CI_REGISTRY
+  # provide password via stdin for security
+  - echo -n $CI_JOB_TOKEN | docker login -u $CI_REGISTRY_USER --password-stdin $CI_REGISTRY
+  - printenv
 
 build-image:
   stage: build
-  script:
-    - docker build --pull -t $CONTAINER_TEST_IMAGE .
+  script: # use cache from latest image
+    - docker pull $CONTAINER_RELEASE_IMAGE || true
+    - docker build --pull --cache-from $CONTAINER_RELEASE_IMAGE -t $CONTAINER_TEST_IMAGE .
     - docker push $CONTAINER_TEST_IMAGE
+  except:
+    - tags
 
-release-image:
+release-image: # when pushing on master
   stage: release
   script:
     - docker pull $CONTAINER_TEST_IMAGE
     - docker tag $CONTAINER_TEST_IMAGE $CONTAINER_RELEASE_IMAGE
     - docker push $CONTAINER_RELEASE_IMAGE
   only:
-    - master
+    refs:
+      - master
 
+release-stable: # when creating a git tag in the form v.x.x.x-
+  stage: release
+  script:
+    - docker pull $CONTAINER_RELEASE_IMAGE
+    - docker tag $CONTAINER_RELEASE_IMAGE $CONTAINER_STABLE_RELEASE_IMAGE
+    - docker push $CONTAINER_STABLE_RELEASE_IMAGE
+  only: # when tagging a version
+    variables:
+      - $CI_COMMIT_TAG =~ /^v\d+.\d+.\d+-?.*$/
+    
 # deploy-image:
 #   stage: deploy
 #   script: