Update GitHub actions #1

	name: Legacy Tests (for elderly pythons)
	on:
	workflow_dispatch:
	pull_request:
	push:
	branches: [ main ]

	jobs:
	legacy:
	name: py${{ matrix.py }} (container)
	runs-on: ubuntu-22.04
	strategy:
	fail-fast: false
	matrix:
	py: ["2.7", "3.5", "3.6", "3.7"]
	container:
	# Use Docker Hub python images to get the exact interpreter
	image: python:${{ matrix.py }}
	steps:
	- uses: actions/checkout@v4

	# --- Toolchain pins per interpreter ---
	- name: Bootstrap tools (py27)
	if: matrix.py == '2.7'
	run: \|
	python -V
	python -m pip install -U 'pip<21' 'setuptools<45' 'wheel<0.35' 'tox<4'
	- name: Bootstrap tools (py35)
	if: matrix.py == '3.5'
	run: \|
	python -V
	python -m pip install -U 'pip<22' 'setuptools<51' 'wheel<0.37' 'tox<4'
	- name: Bootstrap tools (py36)
	if: matrix.py == '3.6'
	run: \|
	python -V
	python -m pip install -U 'pip<23' 'setuptools<60' 'wheel<0.38' 'tox<4'
	- name: Bootstrap tools (py37)
	if: matrix.py == '3.7'
	run: \|
	python -V
	python -m pip install -U 'pip<24' 'setuptools<70' 'wheel<0.41' 'tox<4'

	# --- Install deps & run tests ---
	- name: Test via tox (preferred)
	run: \|
	tox -vv -e py$(echo ${{ matrix.py }} \| tr -d .)

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