add switch for two different init_grib2 approaches for non-E arakawa grids #172

	# This is a CI workflow for the NCEPLIBS-ip project.
	#
	# This workflow builds ip with Spack, including installing with the "--test
	# root" option to run the CTest suite. It also has a one-off job that validates
	# the recipe by ensuring that every CMake option that should be set in the
	# Spack recipe is so set.
	#
	# 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
	Spack:
	strategy:
	matrix:
	os: ["ubuntu-latest"]
	variants: ["+openmp +shared +pic precision=d", "+openmp ~shared ~pic precision=4", "~openmp ~shared +pic precision=8"]
	runs-on: ${{ matrix.os }}

	steps:

	- name: "Install OpenBLAS"
	run: sudo apt install libopenblas-serial-dev

	- name: "Build Spack package"
	uses: NOAA-EMC/ci-test-spack-package@develop
	with:
	package-name: ip
	package-variants: ${{ matrix.variants }} ${{ matrix.variants == '+openmp +shared +pic precision=d' && 'grib-util@develop +tests ^g2c@develop +utils +build_v2_api' \|\| '' }}
	custom-recipe: spack/package.py
	spack-compiler: gcc
	spack-externals: gmake cmake openblas
	repo-cache-key-suffix: ${{ matrix.os }}-${{ matrix.variants }}-1

	# This job validates the Spack recipe by making sure each cmake build option is represented
	recipe-check:
	runs-on: ubuntu-latest

	steps:

	- name: recipe-check
	uses: NOAA-EMC/ci-check-spack-recipe@develop
	with:
	recipe-file: package/spack/package.py
	cmakelists-txt: package/CMakeLists.txt
	ignore-list: ENABLE_DOCS,TEST_TIME_LIMIT

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