Add GitHub Actions workflow for generating static docs #1

	name: Documentation

	on: [push, pull_request]

	jobs:
	generate:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	submodules: true

	- name: Install dependencies
	run: \|
	sudo apt-get update -qq
	sudo apt-get install -y doxygen graphviz qt6-base-dev qt6-declarative-dev qt6-l10n-tools qt6-tools-dev qt6-tools-dev-tools libgl1-mesa-dev

	- name: Build docs
	run: \|
	cmake -D BUILD_DOCS:BOOL=ON -S "$GITHUB_WORKSPACE" -B "$RUNNER_TEMP"
	cmake --build "$RUNNER_TEMP" --target docs

	- name: Upload docs artifact
	uses: actions/upload-artifact@v3
	with:
	name: docs
	path: "${{ runner.temp }}/qtdocs"
	if-no-files-found: error

	publish:
	runs-on: ubuntu-latest
	if: success() && (github.ref == 'refs/heads/master')
	needs: generate
	steps:
	- name: Checkout doc branch
	uses: actions/checkout@v4
	with:
	ref: doc

	- name: Clear previous docs
	run: rm -rf docs

	- name: Download docs artifact
	uses: actions/download-artifact@v3
	with:
	name: docs
	path: docs

	- name: Inspect changes # for diagnostics only.
	run: git status && git diff

	- name: Push updates
	run: \|
	[[ -z $(git status --porcelain) ]] \|\| {
	git config user.name github-actions
	git config user.email github-actions@github.com
	git pull
	git add .
	git commit -m "Update generated docs for ${GITHUB_SHA}"
	git push
	}

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