gitlab kaniko

# Kaniko repo: https://github.com/GoogleContainerTools/kaniko
# Docs:
# - https://github.com/GoogleContainerTools/kaniko/blob/master/docs/tutorial.md
#
# Examples:
## Build iamge from using Dockerfile from 'subdir' in project
# build_image:
#   extends: .build_docker_image
#   variables:
#     KANIKO_CONTEXT: subdir
#     KANIKO_DESTINATION: >
#       $CI_REGISTRY_IMAGE/foo:bar
#       $CI_REGISTRY_IMAGE/foo:latest
#     KANIKO_AUTHS: >
#       /$CI_REGISTRY/$REGISTRY_PUSHER_LOGIN/$REGISTRY_PUSHER_PASSWORD/
#       /$CI_CACHE_REGISTRY/$REGISTRY_PUSHER_LOGIN/$REGISTRY_PUSHER_PASSWORD/
## Build iamge from using Dockerfile from root project dir
# build_another_image:
#   extends: .build_docker_image
#

.build_docker_image:
  stage: build
  image:
    name: $KANIKO_IMAGE_NAME:$KANIKO_IMAGE_TAG
    entrypoint: [""]
  variables:
    KANIKO_IMAGE_NAME: gcr.io/kaniko-project/executor
    KANIKO_IMAGE_TAG: v1.8.1-debug
    KANIKO_AUTHS: >-
      /$CI_REGISTRY/$CI_REGISTRY_USER/$CI_REGISTRY_PASSWORD/
    KANIKO_DESTINATION: >-
      $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
  script:
    - |
      cat > /kaniko/.docker/config.json <<-EOF
      {
        "auths": {$(for i in $KANIKO_AUTHS; do
          printf '%s\n    "%s": {"username": "%s", "password": "%s"}' "${q:+$q}" ${i//\// };q=,
          done)
        }
      }
      EOF

    # See kaniko docs for more info about the arguments passed
    - set -x
    - executor
      ${KANIKO_NOPUSH:+--no-push}
      $(test -n "$KANIKO_NOPUSH" || echo --cache=${KANIKO_CACHE:-true} ${KANIKO_CACHE_REGISTRY:+--cache-repo=$KANIKO_CACHE_REGISTRY})
      --context ${KANIKO_CONTEXT:-.}
      --dockerfile ${KANIKO_DOCKERFILE:-Dockerfile}
      $(printf '--destination %s ' $KANIKO_DESTINATION)
      $KANIKO_EXTRA