Add CI for building docs #5

	name: Documentation

	on:
	pull_request:
	branches:
	- master
	- develop
	paths-ignore:
	- '.github/workflows/cov.yml'
	- '.github/workflows/fast.yml'
	- '.github/workflows/slow.yml'
	- 'tools/**'
	- '*.md'

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

	jobs:
	gcc:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/setup-python@v5
	with:
	python-version: '3.12'

	- name: Install docbook dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -y docbook-xsl docbook-xml xsltproc

	- name: Create user-config.jam
	run: \|
	echo "using xsltproc ;" > user-config.jam
	echo "using boostbook : /usr/share/xml/docbook/stylesheet/nwalsh : /usr/share/xml/docbook/schema/dtd/4.2 ;" >> user-config.jam
	echo "using doxygen : /usr/bin/doxygen ;" >> user-config.jam
	echo "using python : 3.12 : /usr/bin/python3 ; " >> user-config.jam

	- uses: actions/checkout@v4

	- name: Fetch Boost superproject
	run: \|
	cd ..
	git clone -b $GITHUB_BASE_REF --depth 5 https://github.com/boostorg/boost.git
	cd boost
	mv -f $GITHUB_WORKSPACE/* libs/histogram
	git submodule update --init --depth 5 tools/build tools/boostdep
	git submodule update --init --depth 5 libs/format
	python tools/boostdep/depinst/depinst.py --git_args "--depth 5 --jobs 3" histogram
	mv -f * $GITHUB_WORKSPACE

	- name: Prepare b2
	run: ./bootstrap.sh

	- name: Build documentation
	run: \|
	cd libs/histogram
	../../b2 doc

	- name: Upload documentation
	uses: actions/upload-artifact@v4
	with:
	name: histogram-docs
	path: libs/histogram/doc/html
	if-no-files-found: error

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