action.yml

# composite action https://docs.github.com/en/free-pro-team@latest/actions/creating-actions/creating-a-composite-run-steps-action
name: 'Extract Branch Name'
description: 'Extracts Branch Name, Slug and Git Sha of the Current Commit or Pull Request'
outputs:
  BRANCH: # id of output
    description: Name of the branch that this action is being run for. For Pull Requests it will be the pull request id
    value: ${{ steps.composite-action-export-branch.outputs.BRANCH }}
  BRANCH_SLUG:
    description: Slug of the branch name. For Pull Requests it will be "PR-{PRID}"
    value: ${{ steps.composite-action-export-branch.outputs.BRANCH_SLUG }}
  GIT_SHA:
    description: SHA of the (merge) commit that this action is being run for
    value: ${{ steps.composite-action-export-branch.outputs.GIT_SHA }}
runs:
  using: composite
  steps: 
    - shell: bash
      id: composite-action-export-branch
      run: ${{ github.action_path }}/action.sh