name: Use Action

on:
  push:
    branches: ['main']

jobs:
  use-action:
    name: Use Action
    strategy:
      matrix:
        platform: [ubuntu-latest, macos-latest]
    runs-on: ${{ matrix.platform }}

    steps:
      - uses: actions/setup-go@v2
        with:
          go-version: 1.18
      - uses: actions/checkout@v2

      # Minimal publish
      - uses: ko-build/setup-ko@main
      - run: ko publish --bare ./

      - name: Install old release
        uses: ko-build/setup-ko@main
        with:
          version: v0.8.0
      - name: Check installed version
        run: ko version | grep 0.8.0

      - name: Install from tip
        uses: ko-build/setup-ko@main
        with:
          version: tip
      - name: Check installed version (tip)
        run: |
          sudo rm /usr/local/bin/ko # Uninstall previous versions.
          ko version

      # If KO_DOCKER_REPO is set during setup, it's set for future steps.
      - name: Pre-set KO_DOCKER_REPO
        uses: ko-build/setup-ko@main
        env:
          KO_DOCKER_REPO: already-set
      - name: Check pre-set KO_DOCKER_REPO
        run: |
          if [[ "${KO_DOCKER_REPO}" != "already-set" ]]; then
            echo "${KO_DOCKER_REPO} != already-set"
            exit 1
          fi