Create incompressible_viscous solver and lid-driven cavity test problem #393

	name: regtest

	on:
	# Trigger the workflow on push or pull request,
	# but only for the main branch
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	regresion-tests:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	python-version: ["3.8", "3.9", "3.10"]

	steps:
	- uses: actions/checkout@v3

	- name: Install Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}

	- name: Cache pip
	uses: actions/cache@v3
	with:
	# this path is specific to Ubuntu
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
	restore-keys: \|
	${{ runner.os }}-pip-

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt

	- name: Install pyro
	run: pip install .

	- name: Run tests via test.py
	run: \|
	# Numpy 1.24 gets slightly diff answers: https://github.com/numpy/numpy/issues/23289
	export NPY_DISABLE_CPU_FEATURES="AVX512_SKX"
	./pyro/test.py --nproc 0

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