on: push
jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - shell: sh
        run: |
          if [ -z ${BASH+x} ]; then
            echo "I'm sh!"
          else
            exit 1
          fi
  check-container:
    runs-on: ubuntu-latest
    container: alpine:latest
    steps:
      - shell: sh
        run: |
          if [ -z ${BASH+x} ]; then
            echo "I'm sh!"
          else
            exit 1
          fi