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github actions で任意のブランチのみで job を実行する方法

概要

github actions で 特定のブランチだけで実行したい特定の job があるときは、 on オプションでは対応しきれません。
なぜなら、 on オプションではワークフローの実行に対する条件だからです。

ref を参照して、 if を使う

master ブランチのみで実行する job の例
if: github.ref == 'refs/heads/master'

  production_deploy:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/master'
    steps:
      - name: Execute git checkout
        uses: actions/checkout@v2

参考記事
[GitHub Actions] branch conditional
https://github.community/t5/GitHub-Actions/GitHub-Actions-branch-conditional/td-p/29794

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