name: go mod tidy

on:
  push:
    branches:
      - main
      - "release-branch/*"
  pull_request:
    # all PRs on all branches

concurrency:
  group: ${{ github.workflow }}-$${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

jobs:
  check-go-mod-tidy:
    runs-on: [ubuntu-latest]
    timeout-minutes: 8

    steps:
      - name: Check out code
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Set up Go
        uses: actions/setup-go@0aaccfd150d50ccaeb58ebd88d36e91967a5f35b # v5.4.0
        with:
          cache: false
          go-version-file: go.mod

      - name: Check 'go mod tidy' is clean
        run: |
          ./tool/go mod tidy
          echo
          echo
          git diff --name-only --exit-code || (echo "The files above need updating. Please run 'go mod tidy'."; exit 1)