Provide requirements file and update linting workflow to use (pins li… #661

	name: fypp-checks

	on:
	# run on every push - doesn't work on forks
	push:
	# run on every push (not commit) to a PR, plus open/reopen
	pull_request:
	types:
	- synchronize
	- opened
	- reopened


	jobs:
	various:
	name: FYPP checks - runs check on fypp and f90 files
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v4
	with:
	python-version: "3.11"
	- run: pip install fypp

	- name: Check ftorch.fypp matches ftorch.f90
	run: \|
	fypp src/ftorch.fypp src/temp.f90_temp
	if ! diff -q src/ftorch.f90 src/temp.f90_temp; then
	echo "Error: The code in ftorch.f90 does not match that expected from ftorch.fypp."
	echo "Please re-run fypp on ftorch.fypp to ensure consistency and re-commit."
	exit 1
	else
	exit 0
	fi

	- name: Check ftorch_test_utils.fypp matches ftorch_test_utils.f90
	run: \|
	fypp src/ftorch_test_utils.fypp src/temp.f90_temp
	if ! diff -q src/ftorch_test_utils.f90 src/temp.f90_temp; then
	echo "Error: The code in ftorch_test_utils.f90 does not match that expected from ftorch_test_utils.fypp."
	echo "Please re-run fypp on ftorch_test_utils.fypp to ensure consistency and re-commit."
	exit 1
	else
	exit 0
	fi

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