Update.yaml

---
# Automatically builds new TZJData artifacts and creates a PR with the associated
# changes to the `Project.toml` and `Artifacts.toml`. Once the PR has been merged the
# `Release.yaml` workflow will generate a GitHub release with the assets to fufill the
# artifact URLs within the `Artifacts.toml`.

name: Update
on:
  pull_request:
    paths:
      - .github/workflows/Update.yaml
  schedule:
    - cron: "44 9 * * *"  # Every day at 09:44 UTC
  workflow_dispatch: {}
jobs:
  artifacts:
    name: Artifacts
    runs-on: ubuntu-latest
    # These permissions are needed to:
    # - Create PRs: https://github.com/marketplace/actions/create-pull-request#workflow-permissions
    permissions:
      contents: write
      pull-requests: write
    env:
      JULIA_PROJECT: gen
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha || 'main' }}
      - uses: julia-actions/setup-julia@v1
        with:
          version: "1"
      - uses: julia-actions/cache@v1
      - name: Instantiate
        shell: julia --color=yes {0}
        run: |
          using Pkg
          Pkg.instantiate()
      - name: Build tzdata
        id: build
        shell: julia --color=yes {0}
        run: |
          include(joinpath(pwd(), "gen", "make.jl"))
          if is_pkg_tzdata_version_outdated()
              (; tarball_path, tarball_sha256, new_version, commit_message) = update_tzdata()
              key = basename(tarball_path) * "-" * tarball_sha256
              @show key tarball_path commit_message
              open(ENV["GITHUB_OUTPUT"], "a") do io
                  println(io, "updated=true")
                  println(io, "key=$key")
                  println(io, "tarball_path=$tarball_path")
                  println(io, "commit_message=$commit_message")
              end
          else
              open(ENV["GITHUB_OUTPUT"], "a") do io
                  println(io, "updated=false")
              end
          end
          println("workflow_ref=${{ github.workflow_ref }}")
      - run: git diff
      # Store the Julia artifact tarball as a GitHub actions artifact. This will allow us to retrieve this
      # tarball from other workflows.
      - uses: actions/upload-artifact@v4
        if: ${{ steps.build.outputs.updated == 'true' }}
        id: action-artifact
        with:
          name: ${{ steps.build.outputs.key }}
          path: ${{ steps.build.outputs.tarball_path }}
      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v5
        if: ${{ steps.build.outputs.updated == 'true' }}
        with:
          base: main  # Shouldn't be required for `workflow_dispatch`
          title: ${{ steps.build.outputs.commit_message }}
          body: >-
            An automated PR generated by the ${{ github.workflow }} workflow.
          add-paths: |
            Project.toml
            Artifacts.toml
          commit-message: ${{ steps.build.outputs.commit_message }}
          branch: gh/update-tzdata
          token: ${{ secrets.TZJDATA_UPDATE_TOKEN }}  # TODO: Fine-grained token expires

  # Work around having GitHub suspend the scheduled workflow if there is no commit activity
  # for the past 60 days. As this repo doesn't get much activity beyond artifact updates
  # this can be quite annoying.
  keepalive:
    name: Keepalive
    runs-on: ubuntu-latest
    # These permissions are needed to:
    # - Keep the workflow alive: https://github.com/marketplace/actions/keepalive-workflow#github-api-keepalive-workflow---default-for-github-actions-users
    permissions:
      actions: write
    steps:
      - uses: actions/checkout@v4
      - uses: gautamkrishnar/keepalive-workflow@v2