A GitLab CI ready image which fails if the current branch is too outdated from master.

Secret Variables to set:

• PLZREBASE_THRESHOLD - How many commits behind are permitted, 50 by default
• PLZREBASE_BRANCH_TO_COMPARE - master by default
• PLZREBASE_BRANCH_PREFIX_EXCLUDE - Comma-separated prefixes to exclude (e.g.: release,dev)
• PLZREBASE_SLACK_WEBHOOK_URL - Incoming webhook URL
• PLZREBASE_SLACK_CHANNEL - Defaults to webhook channel

Example CI config:

stages:
  - build
  - test
  [ ... ]

build: 
  stage: build
  [ ... ]

plzrebase:
  stage: build
  image: kiwicom/plzrebase
  script:
   - plzrebase