[readme] fix preview instructions, elucidate non-nvidia alternatives #5

	name: pre-merge

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}

	on:
	pull_request:
	workflow_dispatch:

	jobs:
	pre-merge:
	runs-on: ubuntu-22.04
	strategy:
	matrix:
	python-version: ["3.8", "3.10"]
	include:
	- python-version: "3.8"
	python-py-version: "py38"
	- python-version: "3.10"
	python-py-version: "py310"
	container:
	image: ghcr.io/${{ github.repository }}-ci:${{ matrix.python-py-version }}-poetry-gl-bullseye
	credentials:
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	steps:
	- uses: actions/checkout@v3
	- name: Poetry Venv Dir
	run: \|
	echo "VENV_DIR=$(poetry config virtualenvs.path)" >> $GITHUB_ENV

	- name: Restore the Cache
	id: cache-deps
	uses: actions/cache@v3
	with:
	path: ${{ env.VENV_DIR }}
	# bump the suffix if you need to force-refresh the cache
	key: py-trees-ci-cache-${{ matrix.python-version }}-${{ hashFiles('/poetry.lock', '/tox.ini') }}-1

	# Install all deps, sans the project (--no-root)
	- name: Poetry - Install Dependencies
	run: poetry install --no-interaction --no-root
	if: steps.cache-deps.outputs.cache-hit != 'true'

	# Project is installed separately to avoid always invalidating the cache
	- name: Poetry - Install Project
	run: poetry install --no-interaction

	- name: Tox - Tests
	run: poetry run tox --workdir ${{ env.VENV_DIR }} -e ${{ matrix.python-py-version }}
	- name: Tox - Formatters, Linters
	run: poetry run tox --workdir ${{ env.VENV_DIR }} -e check

Provide feedback