add github action to update dependencies using poetry #1

	name: Generate requirements.txt for readthedocs

	on:
	schedule:
	- cron: '0 1 * * 1'
	push:
	workflow_dispatch:

	jobs:
	update_dependencies:
	runs-on: ubuntu-latest
	steps:
	# Check out repo and set up Python
	- uses: actions/checkout@v3
	with:
	lfs: true

	# Use cached python and dependencies, install poetry
	- name: "Setup Python, Poetry and Dependencies"
	uses: packetcoders/action-setup-cache-python-poetry@main
	with:
	python-version: 3.8
	poetry-version: 1.2.2

	# update poetry lockfile
	- name: "Update poetry lock file"
	id: update
	run: \|
	update_output=$(poetry run poetry update)
	echo "update_output=$update_output" >> $GITHUB_OUTPUT
	status=$(git status \| grep poetry.lock)
	echo "status=$status" >> $GITHUB_OUTPUT

	# create pull request if necessary
	- name: "Create Pull Request"
	uses: peter-evans/create-pull-request@v5
	if: ${{ steps.update.outputs.status != '' }}
	with:
	commit-message: Update dependencies
	title: "Update dependencies"
	body: \|
	- Dependency updates
	${{ steps.update.outputs.update_output }}

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