.gitlab-ci.yml

image: docker:latest

services:
  - docker:dind

variables:
  DOCKER_DRIVER: overlay

before_script:
  # Install CA certs, openssl to https downloads, python for gcloud sdk
  - apk add --update make ca-certificates openssl python
  - update-ca-certificates
  # Write our GCP service account private key into a file
  - echo $GCLOUD_SERVICE_KEY > ${HOME}/gcloud-service-key.json
  # Download and install Google Cloud SDK
  - wget https://dl.google.com/dl/cloudsdk/release/google-cloud-sdk.tar.gz
  - tar zxvf google-cloud-sdk.tar.gz && ./google-cloud-sdk/install.sh --usage-reporting=false --path-update=true
  - google-cloud-sdk/bin/gcloud --quiet components update
  - google-cloud-sdk/bin/gcloud auth activate-service-account --key-file ${HOME}/gcloud-service-key.json
  - docker login -u _json_key --password-stdin https://gcr.io < ${HOME}/gcloud-service-key.json

stages:
  - publish

publish-master:
  stage: publish
  script:
    - docker build --pull -t "gcr.io/$GCLOUD_PROJECT_ID/$CI_PROJECT_NAME" .
    - docker push "gcr.io/$GCLOUD_PROJECT_ID/$CI_PROJECT_NAME:latest"
  only:
    - master

publish-branch:
  stage: publish
  script:
    - docker build --pull -t "gcr.io/$GCLOUD_PROJECT_ID/$CI_PROJECT_NAME:$CI_COMMIT_REF_SLUG" .
    - docker push "gcr.io/$GCLOUD_PROJECT_ID/$CI_PROJECT_NAME:$CI_COMMIT_REF_SLUG"
  except:
    - master