Template .gitlab-ci.yml for automating docker image build, test, release

.gitlab-ci.yml

image: docker:1.11.2-git
stages:
  - build
  - test
  - release
  #- deploy

variables:
  CONTAINER_IMAGE_NAME: myImage
  CONTAINER_REGISTRY_NAMESPACE: myNamespace
  CONTAINER_REGISTRY_DOMAIN: registry.gitlab.com
  CONTAINER_RELEASE_IMAGE: $CONTAINER_REGISTRY_DOMAIN/$CONTAINER_REGISTRY_NAMESPACE/$CONTAINER_IMAGE_NAME:latest
  
before_script:
  # Generate the test image tag from branch name, e.g.
  # branch `feature/amazeballs-thing` becomes the docker image tag `feature-amazeballs-thing`
  - CONTAINER_TEST_IMAGE=$CONTAINER_REGISTRY_DOMAIN/$CONTAINER_REGISTRY_NAMESPACE/$CONTAINER_IMAGE_NAME:`echo $CI_BUILD_REF_NAME | sed -e 's/[\/|.]/-/g'`
  - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN $CONTAINER_REGISTRY_DOMAIN
  
build:
  stage: build
  script:
    # optional meta data to shove into your app image
    - echo $CI_BUILD_REF > ./meta/hash
    - echo $CI_BUILD_REF_NAME > ./meta/branch
    # builds and push the test image
    - docker build -t $CONTAINER_TEST_IMAGE .
    - docker push $CONTAINER_TEST_IMAGE

test:
  stage: test
  script:
    # your CI test script -- exit 0 for success or exit > 0 for failure, optionally output coverage info here
    - ./scripts/test.sh $CONTAINER_TEST_IMAGE

release-image:
  stage: release
  script:
    # finally, if this is the master branch, tag and push the image to `latest`
    - docker pull $CONTAINER_TEST_IMAGE
    - docker tag $CONTAINER_TEST_IMAGE $CONTAINER_RELEASE_IMAGE
    - docker push $CONTAINER_RELEASE_IMAGE
  only:
    - master
    
#deploy:
#  stage: deploy
#  script:
#    - echo "deploy script should run here..."
##    - ./deploy.sh
#  only:
#    - master