Add a linter to check the images' alt text #86

	name: Minimum version tests

	on:
	push:
	branches:
	- main
	- 'stable/**'
	pull_request:
	branches:
	- main
	- 'stable/**'

	jobs:
	tests:
	name: minimum version tests (${{ matrix.os }}, ${{ matrix.python-version }})
	runs-on: ubuntu-latest
	timeout-minutes: 30
	strategy:
	max-parallel: 4
	matrix:
	os: [ubuntu-latest]
	python-version: [3.9]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies (minimum versions)
	shell: bash
	run: \|
	python -m pip install --upgrade pip
	python -m pip install extremal-python-dependencies==0.0.3
	pip install "tox==$(extremal-python-dependencies get-tox-minversion)"
	extremal-python-dependencies pin-dependencies-to-minimum --inplace
	- name: Test using tox environment
	shell: bash
	run: \|
	tox -e py,notebook,doctest --parallel --parallel-no-spinner

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