Refs #265. Try using docker images for legacy pythons #2

	name: CI

	on:
	push:

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	include:
	- python-version: 2.7
	image: python:2.7-slim
	- python-version: 3.6
	image: python:3.6-slim
	- python-version: 3.7
	image: python:3.7-slim
	container:
	image: python:${{ matrix.python-version }}-slim
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: pip install --requirement requirements/testing.txt
	- name: Run tests
	run: nosetests --with-doctest []

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