on: push
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      # ERROR: ref is missing
      - uses: actions/checkout
      # ERROR: owner name is missing
      - uses: checkout@v2
      # ERROR: tag is empty
      - uses: 'docker://image:'
      # ERROR: local action must start with './'
      - uses: .github/my-actions/do-something
