....
progressive-lint:
  group: build
  image: node:8.9.4
  commands:
    - git fetch origin master
    - FILES_CHANGED=$(git diff --name-only origin/master | grep '.js*$' || true)
    - npm run lint:progressive $FILES_CHANGED --unsafe-perm --quiet
  when:
    branch:
      exclude: [ master, hotfix/* ]