GitHub Actions のコンテナ内にSSH接続してデバッグする方法

Snippetとして残しておく。

.github/workflows/ci.yamlに以下のjobを追加する。

name: CI
on: [push]
jobs:
  debug:
    strategy:
      matrix:
        os: [ubuntu-latest]
        ruby: ['3.1']
    runs-on: ${{ matrix.os }}
    steps:
      - uses: ruby/setup-ruby@v1
        with:
          ruby-version: ${{ matrix.ruby }}
          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
      - uses: actions/checkout@v3
      - name: Setup tmate session
        uses: mxschmitt/action-tmate@v3

If no user has connected within 10 minutes after the post-job step started, it will terminate the tmate session and quit gracefully.

とのこと。

Ref.