Merge current state of ixmp4-dev into ixmp4 #43

	name: build the docs

	on:
	push:
	branches: ["main"]
	pull_request:
	branches: ["**"]

	jobs:
	build-docs:
	runs-on: ubuntu-latest

	steps:
	#----------------------------------------------
	# check-out repo and set-up python
	#----------------------------------------------
	- name: Check out repository
	uses: actions/checkout@v3
	- name: Set up python
	id: setup-python
	uses: actions/setup-python@v4
	with:
	python-version: "3.10"
	#----------------------------------------------
	# ----- install & configure poetry -----
	#----------------------------------------------
	- name: Install Poetry
	uses: snok/install-poetry@v1
	with:
	virtualenvs-create: true
	virtualenvs-in-project: true
	installer-parallel: true
	#----------------------------------------------
	# load cached venv if cache exists
	#----------------------------------------------
	- name: Load cached venv
	id: cached-poetry-dependencies
	uses: actions/cache@v2
	with:
	path: .venv
	key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
	#----------------------------------------------
	# install your root project, if required
	#----------------------------------------------
	- name: Install library
	run: poetry install --no-interaction --with docs,dev,server
	#----------------------------------------------
	# build the docs
	#----------------------------------------------
	- name: Build the docs
	run: \|
	source .venv/bin/activate
	make --directory=doc html

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