Make sure tox is available #165

	name: Linux CI

	env:
	# NOTE: This version must match between all .yml files in the
	# .github/workflows directory
	TOX_VERSION: 4.0.9

	on:
	# Triggers the workflow on push or pull request events but only for the main branch
	push:
	branches: [python]
	pull_request:
	branches: [python]

	jobs:
	shellcheck:
	name: Shellcheck
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Run ShellCheck
	uses: ludeeus/action-shellcheck@master
	tox:
	runs-on: ubuntu-22.04
	env:
	# This is a regex:
	# https://github.com/tox-dev/tox/pull/990/files#diff-bfeb43314e311bd2d19d2b1ea565841101c8468f0df8cd3f86b4f199f06c0766
	#
	# We skip shellcheck because we already run it in its own job ^, which
	# feels simpler than having to install shellcheck manually in here.
	TOX_SKIP_ENV: shellcheck
	steps:
	- name: Check out repository code
	uses: actions/checkout@v4
	with:
	fetch-depth: 0 # For getting tags from the repo
	- name: Cache .tox directory
	uses: actions/cache@v3
	with:
	path: .tox
	key: ${{ runner.os }}-${{ hashFiles('tox.ini') }}
	- name: Create a virtualenv
	run: \|
	python3 -m venv env
	- name: Install tox in our virtualenv
	run: \|
	. ./env/bin/activate
	pip install tox==${{ env.TOX_VERSION }}
	- name: Run tox in our virtualenv
	run: \|
	. ./env/bin/activate
	tox

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