Fix Dependabot Go modules PRs

dependabot-go-fixup.yaml

name: Dependabot Go modules

on:
  pull_request:
    paths:
      - "go.mod"
      - "go.sum"

jobs:
  dependabot:
    name: Check Dependabot’s work
    if: startsWith(github.ref, 'refs/heads/dependabot/') || startsWith(github.head_ref, 'dependabot/')
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repo
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.SEPARATE_GITHUB_ACCESS_TOKEN }}
          ref: ${{ github.head_ref }} # Ensures we check out the branch, not the PR ref
          submodules: recursive

      - name: Set up Go
        uses: actions/setup-go@v2-beta
        with:
          go-version: ^1

      - name: Cache Go modules
        uses: actions/cache@v1
        with:
          path: ~/go/pkg/mod
          key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
          restore-keys: |
            ${{ runner.os }}-go-mod-

      - name: Download Go modules
        run: |
          go mod download
          go mod tidy
          go test -i -mod=readonly -race ./...

      - name: Verify repo is unchanged
        run: git diff --exit-code HEAD

      - name: Create fixup commit
        if: failure()
        run: |
          git config --global user.email email@example.com
          git config --global user.name dependabot-fixup
          git add go.mod go.sum
          git commit -m "go.{mod,sum}: fixup commit for Dependabot"
          git push origin -u HEAD