Create pull request to bump git version via GitHub Actions

bump-git.yml

name: Bump git

on:
  schedule:
    - cron: "0 0 * * 1-5"
  workflow_dispatch:

env:
  target_file: Dockerfile

jobs:
  bump-git:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: octokit/graphql-action@v2.x
        id: latest_tag
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          query: |
            query {
              repository(owner: "git", name: "git") {
                refs(refPrefix: "refs/tags/", first: 1, orderBy: {field: TAG_COMMIT_DATE, direction: DESC}) {
                  edges {
                    node {
                      name
                    }
                  }
                }
              }
            }
      - name: Set variables
        id: vars
        run: |
          latest_version=$(echo '${{ fromJson(steps.latest_tag.outputs.data).repository.refs.edges[0].node.name }}' | sed -E 's/^v(.+)/\1/')
          echo ::set-output name=latest_version::${latest_version}
          echo ::set-output name=current_version::$(grep -o -E 'GIT_VERSION=.+$' '${{ env.target_file }}' | sed -E 's/GIT_VERSION=//')
          if [[ ${latest_version} =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo ::set-output name=valid_version::true
          else
            echo "Skip bumping to ${latest_version}"
          fi
      - name: Update file
        run: sed -i -E 's/GIT_VERSION=.+$/GIT_VERSION=${{ steps.vars.outputs.latest_version }}/' '${{ env.target_file }}'
        if: ${{ steps.vars.outputs.valid_version == 'true' }}
      - uses: peter-evans/create-pull-request@v3
        if: ${{ steps.vars.outputs.valid_version == 'true' }}
        with:
          title: Bump git from ${{ steps.vars.outputs.current_version }} to ${{ steps.vars.outputs.latest_version }}
          body: |
            - https://github.com/git/git/blob/v${{ steps.vars.outputs.latest_version }}/Documentation/RelNotes/${{ steps.vars.outputs.latest_version }}.txt
            - https://github.com/git/git/compare/v${{ steps.vars.outputs.current_version }}...v${{ steps.vars.outputs.latest_version }}
          branch: bump-git-${{ steps.vars.outputs.latest_version }}

See also

• https://github.com/git/git
• https://docs.github.com/en/graphql/reference/objects#refconnection
• https://github.com/octokit/graphql-action
• https://github.com/peter-evans/create-pull-request