Add stretching for LMN #658

	# This is a basic workflow to help you get started with Actions

	name: Build

	# Controls when the action will run. Triggers the workflow on push or pull request
	# events but only for the master branch
	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	build:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v4

	# We don't want to build openmpi each time this workflow is
	# run. Setup caching of OpenMPI after it is built and installed.
	# See "Caching dependencies to speed up workflows" on the GH
	# actions docs.
	- name: Cache OpenMPI
	id: cache-openmpi
	uses: actions/cache@v4
	with:
	path: openmpi-4.1.4/installed
	key: openmpi-4.1.4

	- name: Build openmpi
	if: steps.cache-openmpi.outputs.cache-hit != 'true'
	run: \|
	wget https://download.open-mpi.org/release/open-mpi/v4.1/openmpi-4.1.4.tar.gz
	tar -xf openmpi-4.1.4.tar.gz
	cd openmpi-4.1.4/ && mkdir installed
	./configure --prefix=$(pwd)/installed
	make all install

	- name: Build Xcompact3d
	run: \|
	export PATH=$(pwd)/openmpi-4.1.4/installed/bin/:$PATH
	pip install numpy
	export FC=mpif90
	cmake -S . -B build
	cmake --build build -j 2
	cmake --install build
	ctest --test-dir build

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