update-submodules.yml

name: Update Submodules
env:
  BUILD_USER: ${{ secrets.BUILD_USER }}
  BUILD_USER_EMAIL:  ${{ secrets.BUILD_USER_EMAIL }}
on:
  push:
    branches: [ develop ]
  repository_dispatch:
    types: [dispatch-update-website]
  workflow_dispatch:
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: setup git user
        run: |
          git config --global user.email ${BUILD_USER_EMAIL}
          git config --global user.name ${BUILD_USER}
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          submodules: recursive
          ref: develop
      - name: update latest changes of devonfw-guide
        id: update-submodules
        run: |
          git submodule update --remote
          git add -u
          
          # just commit if there is anything to committo prevent errors
          if $(git diff --cached --exit-code)
          then
            echo "Nothing to commit!"
            echo "::set-output name=updated::false"
          else
            git commit -m "[DocUpdate]"
            git push origin develop
            echo "::set-output name=updated::true"
          fi
      - name: Dispatch Website Build
        uses: guilouro/multiple-repositories-dispatch@v1.0.0
        if: steps.update-submodules.outputs.updated == 'true'
        with:
          repo_token: ${{ secrets.GHA_TOKEN }}
          event_type: dispatch-build-website
          repositories: |
            devonfw/devonfw.github.io