Fix release procedure in DEVELOPING.md #30

	# copied from https://github.com/marketplace/actions/install-poetry-action
	name: publish

	on:
	push:
	tags: ["v*"]
	release:
	types: ["published"]

	jobs:
	publish:
	runs-on: ubuntu-latest
	permissions:
	id-token: write
	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: "3.11"
	#----------------------------------------------
	# ----- install & configure poetry -----
	#----------------------------------------------
	- name: Install Poetry
	uses: snok/install-poetry@v1
	with:
	virtualenvs-create: true
	virtualenvs-in-project: true
	installer-parallel: true
	- name: Install poetry dynamic versioning plugin
	run: poetry self add "poetry-dynamic-versioning[plugin]"
	- name: Build package
	run: poetry build
	- if: github.event_name == 'release'
	name: Publish distribution to PyPI
	uses: pypa/gh-action-pypi-publish@release/v1
	- if: github.event_name != 'release'
	name: Publish distribution to Test PyPI
	uses: pypa/gh-action-pypi-publish@release/v1
	with:
	repository-url: https://test.pypi.org/legacy/

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