50x speedup in redtoreg function #311

	name: Build and Test Linux
	on: [push, pull_request]
	jobs:
	build-linux:
	name: Python (${{ matrix.python-version }})
	runs-on: ubuntu-latest
	env:
	PROJ_DIR: /usr
	PROJ_LIB: /usr/share/proj
	strategy:
	matrix:
	#python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
	python-version: ["3.9"]
	steps:

	- uses: actions/checkout@v4

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

	- name: Install Ubuntu Dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install gfortran libeccodes-dev

	- name: Update Pip
	run: \|
	python -m pip install --upgrade pip

	- name: Install some dependencies via pip
	run: \|
	# Install pyspharm using a few tricks
	pip install numpy setuptools wheel
	FFLAGS="-fallow-argument-mismatch" pip install --no-use-pep517 pyspharm
	# for later building/checking
	pip install build twine
	pip install check-manifest
	# below here only needed for mpl/cartopy based tests
	pip install pytest-mpl
	pip install cartopy

	- name: Install pygrib
	run: \|
	pip install -e .

	- name: Test
	run: \|
	cd test
	export MPLBACKEND=agg
	pytest test*py --mpl --mpl-baseline-path=baseline_images
	# if no mpl/cartopy run this
	#pytest test.py test_latlons.py

	- name: Tarball
	run: \|
	python -m build --sdist
	check-manifest --verbose
	twine check --strict dist/*

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