GitLab CI example snippet for building and releasing images to Heroku

.gitlab-ci.yml

stages:
  - build
  - release

build_image:
  only:
    - master
  image: registry.gitlab.com/majorhayden/container-buildah
  stage: build
  variables:
    STORAGE_DRIVER: "vfs"
    BUILDAH_FORMAT: "docker"
  before_script:
    - dnf install -y nodejs
    - curl https://cli-assets.heroku.com/install.sh | sh
    - sed -i '/^mountopt =.*/d' /etc/containers/storage.conf # https://major.io/2019/08/13/buildah-error-vfs-driver-does-not-support-overlay-mountopt-options/
  script:
    - buildah bud --iidfile iidfile -t cd-alediaferia:$CI_COMMIT_SHORT_SHA .
    - buildah push --creds=_:$(heroku auth:token) $(cat iidfile) registry.heroku.com/cd-alediaferia/web

release:
  only:
    - master
  image: node:10.17-alpine
  stage: release
  before_script:
    - apk add curl bash
    - curl https://cli-assets.heroku.com/install.sh | sh
  script:
    - heroku container:release -a cd-alediaferia web