Bump actions/checkout to v4. #6

	name: Release

	on:
	push:
	tags:
	- '*'

	jobs:
	build:
	if: github.repository == 'jazzband/django-invitations'
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.8

	- name: Install dependencies
	run: \|
	python -m pip install -U pip
	python -m pip install -U poetry

	- name: Build package
	run: \|
	poetry build

	- name: Upload packages to Jazzband
	if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
	run: \|
	poetry config repositories.jazzband https://jazzband.co/projects/django-invitations/upload
	poetry config http-basic.jazzband jazzband ${{ secrets.JAZZBAND_RELEASE_KEY }}
	poetry publish -r jazzband

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