Add DCO signoff #1

	name: Generate documentation

	on:
	push:
	branches:
	- main
	workflow_dispatch:

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	documentation-main:
	name: Build Doxygen documentation on `main`

	runs-on: ubuntu-latest

	permissions:
	# Let the default GITHUB_TOKEN commit and push.
	contents: write

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

	- name: Clear out `docs/` subdirectory
	run: rm -rf docs

	- name: Checkout `gh-pages` into `docs/`
	uses: actions/checkout@v4
	with:
	path: docs
	ref: gh-pages

	- name: Set up dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -qy doxygen

	- name: Build documentation
	# Best way to pass Doxygen config overrides on the command line is
	# using stdin.
	run: \|
	( cat Doxyfile ; echo "PROJECT_NUMBER=${{ github.sha }}" ) \| doxygen -

	- name: Commit new API documentation to `gh-pages`
	run: \|
	cd docs/
	git config --global user.name "${{ github.actor }}"
	git config --global user.email "${{ github.actor }}@users.noreply.github.com"
	git commit -s -am "Update C++ API docs from commit ${{ github.sha }} on main"
	git push

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