build-and-deploy.yml

name: Build and Deploy

on:
  push:
    branches:
      - master
  workflow_dispatch:

# This is just a guard against two of these actions
# running at the same time. Not likely an issue for
# us right now, but it could happen.
concurrency: build-and-deploy-${{ github.ref }}

jobs:
  check-for-doc-changes:
    runs-on: ubuntu-latest

    steps:
      - name: Check for changes in docs folder
        id: docs_check
        run: |
          if git diff --quiet HEAD^ HEAD --name-only | grep -q '^docs/'; then
            echo "::set-output name=docs_changed::true"
          else
            echo "::set-output name=docs_changed::false"
          fi

  deploy-docs:
    runs-on: ubuntu-latest
    needs: check_docs_changes
    if: needs.check-for-doc-changes.outputs.docs_changed == 'true'

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Deploy documentation
        uses: JamesIves/github-pages-deploy-action@v4
        with:
          folder: docs
          branch: gh-pages # default for this action, but including to be explicit