Add Spack-based CI #3

	# This is a CI workflow for the NCEPLIBS-grib_util project.
	#
	# This workflow builds grib_util with Spack, including installing with the "--test
	# root" option to run the CTest suite.
	#
	# Alex Richert, Sep 2023
	name: Spack
	on:
	push:
	branches:
	- develop
	pull_request:
	branches:
	- develop

	jobs:
	# This job builds with Spack using every combination of variants and runs the CTest suite each time
	MacOS:
	runs-on: macos-latest

	strategy:
	matrix:
	openmp: ["+openmp", "~openmp"]

	steps:

	- name: checkout-grib-util
	uses: actions/checkout@v4
	with:
	path: grib-util

	- name: spack-build-and-test
	run: \|
	git clone -c feature.manyFiles=true https://github.com/spack/spack
	. spack/share/spack/setup-env.sh
	spack env create grib-util-env $GITHUB_WORKSPACE/grib-util/spack/spack.yaml
	spack env activate grib-util-env
	cp $GITHUB_WORKSPACE/grib-util/spack/package.py $SPACK_ROOT/var/spack/repos/builtin/packages/grib-util/package.py
	mv $GITHUB_WORKSPACE/grib-util $SPACK_ENV/grib-util
	spack develop --no-clone grib-util@develop
	spack add grib-util@develop%gcc@11 ${{ matrix.openmp }}
	spack external find cmake gmake
	spack concretize
	spack install --verbose --test root

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