How to "[skip ci]" on GitHub Actions

skip-ci-on-actions.yml

# See also:
# - https://github.com/actions/runner/issues/774
# - https://help.github.com/en/actions/reference/events-that-trigger-workflows#push-event-push
# - https://help.github.com/en/actions/reference/events-that-trigger-workflows#pull-request-event-pull_request
# - https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions

name: "[skip ci]" on Actions

on: [push, pull_request]

jobs:
  check_skip:
    runs-on: ubuntu-latest
    if: |
      !contains(format('{0} {1}', github.event.head_commit.message, github.event.pull_request.title), '[skip ci]')
    steps:
      - run: |
          echo 'github.event_name: ${{ github.event_name }}'
          echo 'github.event:'
          echo '${{ toJson(github.event) }}'
  build:
    needs: check_skip
    runs-on: ubuntu-latest
    steps:
      - run: echo 'Hi!'

I fear that join(github.event.pull_request.title, github.event.pull_request.body) does not quite do what you'd expect it to do: it uses the second parameter as separator. But since the first parameter is not an array, that separator is never used. See https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#join for details.

(The best workaround I could come up with is to use format('{0} {1}', github.event.pull_request.title, github.event.pull_request.body).)

@dscho Thanks a lot for your advice! As you pointed out, my usage of the join() function was wrong. 😅

I've updated the file, so I would be appreciated if it could help you. 😊

How do I use this?

actions/runner#774

Usage

For pull requests

Include [skip ci] to a pull request title.

For commit pushes

Include [skip ci] to a commit message.

Official support! 🎉🎉🎉
https://github.blog/changelog/2021-02-08-github-actions-skip-pull-request-and-push-workflows-with-skip-ci