name: checkout
description: Checkout the git repository.
runs:
  using: composite
  steps:
    - run: |
        set -eu
        if ! command -v bash >/dev/null; then
          printf 'Bash is needed to use this action.'
          exit 1
        fi
        if ! command -v git >/dev/null; then
          printf 'Git is needed to use this action.'
          exit 1
        fi
      shell: sh
    - run: |
        set -eu
        git init
        git remote add origin "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
        git fetch --no-tags --prune --no-recurse-submodules --depth=1 origin "+${GITHUB_SHA}:${GITHUB_REF}"
        git checkout --force "${GITHUB_REF}"
      shell: bash