check_for_new_release.yml

# Found at https://stackoverflow.com/questions/58465057/trigger-a-github-actions-when-another-repository-creates-a-release
# and modified for our purposes. Simple premise: fetch release and prerelease information from github api url's, parse
# into variables and check against committed files to verify the current build version numbers. If any changes, commit
# new version files which will then fire off the docker build workflow. The magic which allows this to happen is in the
# REPO_SCOPED_TOKEN which literally is a github token with full 'repo' scope privileges.
name: Get latest release version
on:
  schedule:
    # Set time to run to 18:00, which is I think UTC time? About 5 hours ahead of my time. Should be around 1 pm.
    - cron: '0 18 * * *'
  workflow_dispatch:

jobs:
  get-version:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          token: ${{ secrets.REPO_SCOPED_TOKEN }}

      - name: Fetch release version
        id: release_version
        run: |
          curl -sL https://api.github.com/repos/element-hq/synapse/releases/latest | \
          echo "release_version=$( jq -r '.tag_name')" >> $GITHUB_OUTPUT

      - name: Fetch pre-release version
        id: prerelease_version
        run: |
          curl -sL https://api.github.com/repos/element-hq/synapse/releases | \
          echo "prerelease_version=$(jq -r 'map(select(.tag_name)) | first | .tag_name')" >> $GITHUB_OUTPUT

      - name: Check recorded versions
        id: version_check
        shell: bash
        run: |
          if [ "${{ steps.release_version.outputs.release_version }}" != "$(cat release-versions/synapse-latest.txt)" ]; then
            echo "Updating synapse-latest.txt"
            echo "${{ steps.release_version.outputs.release_version }}" > release-versions/synapse-latest.txt
          fi
          if [ "${{ steps.prerelease_version.outputs.prerelease_version }}" != "$(cat release-versions/synapse-prerelease.txt)" ]; then
            echo "Updating synapse-prerelease.txt"
            echo "${{ steps.prerelease_version.outputs.prerelease_version }}" > release-versions/synapse-prerelease.txt
          fi

      - name: Check for modified files
        id: git-check
        run: |
          echo "modified=$([ -z `git status --porcelain` ] && echo 'false' || echo 'true')" >> $GITHUB_OUTPUT

      - name: Commit latest versions
        if: ${{ steps.git-check.outputs.modified == 'true' }}
        run: |
          git config --global user.name 'Jason Little'
          git config --global user.email 'realtyem@users.noreply.github.com'
          git commit -am "Update Synapse versions(automated)"
          git push