Run actionlint on GitHub Actions

actionlint-problem-matcher.json

{
  "problemMatcher": [
    {
      "owner": "actionlint",
      "severity": "warning",
      "pattern": [
        {
          "regexp": "^([^:]+):(\\d+):(\\d+): (.+) \\[(\\S+)\\]$",
          "file": 1,
          "line": 2,
          "column": 3,
          "message": 4,
          "code": 5
        }
      ]
    }
  ]
}

actionlint.yml

name: actionlint

on:
  push:
    branches: ["master"]
  pull_request:
    branches: ["**"]

jobs:
  actionlint:
    runs-on: macos-latest
    steps:
      - uses: actions/checkout@v2
      - run: brew tap 'rhysd/actionlint' 'https://github.com/rhysd/actionlint'
      - run: brew install actionlint
      # Add shellcheck if you need it
      # - run: brew install shellcheck
      # https://github.com/actions/toolkit/blob/2f164000dcd42fb08287824a3bc3030dbed33687/docs/commands.md#problem-matchers
      - name: Set up Problem Matcher
        run: echo '::add-matcher::.github/actionlint-problem-matcher.json'
      - run: actionlint -oneline
        continue-on-error: true

• https://github.com/rhysd/actionlint

$ tree .github
.github
├── actionlint-problem-matcher.json
└── workflows/
    └── actionlint.yml