Use setup-python cache #504

	name: Release

	on: push

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	- name: Install dependencies and set path
	run: \|
	sudo apt-get update
	sudo apt-get install -y ninja-build libcunit1-dev python3-pip
	# Install meson as root so we can install to the system below.
	sudo pip install meson
	- name: Build tarball and changelogs
	run: \|
	git rm -rf c/tests/meson-subproject
	git config --global user.email "[email protected]"
	git config --global user.name "Mr Robot"
	git add -A
	git commit -m "dummy commit to make meson not add in the symlinked directory"
	meson c build-gcc
	meson dist -C build-gcc
	python docs/convert_changelog.py c/CHANGELOG.rst > C-CHANGELOG.txt
	python docs/convert_changelog.py python/CHANGELOG.rst > PYTHON-CHANGELOG.txt
	- name: Get the version
	id: get_version
	run:
	echo ::set-output name=VERSION::$(echo $GITHUB_REF \| cut -d / -f 3)
	- name: C Release
	uses: softprops/action-gh-release@v1
	if: startsWith(github.ref, 'refs/tags/') && contains(github.event.ref, 'C_')
	with:
	name: C API ${{ steps.get_version.outputs.VERSION }}
	body_path: C-CHANGELOG.txt
	draft: True
	fail_on_unmatched_files: True
	files: build-gcc/meson-dist/*
	- name: Python Release
	uses: softprops/action-gh-release@v1
	if: startsWith(github.ref, 'refs/tags/') && !contains(github.event.ref, 'C_')
	with:
	name: Python ${{ steps.get_version.outputs.VERSION }}
	body_path: PYTHON-CHANGELOG.txt
	draft: True
	fail_on_unmatched_files: True

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