add `{pre,post}_prepare_hook` for LLVM to solve A64FX build issue by changing `optarch` #461

	# documentation: https://help.github.com/en/articles/workflow-syntax-for-github-actions
	name: Test software licenses
	on:
	push:
	branches: [ "main" ]
	pull_request:
	permissions:
	contents: read # to fetch code (actions/checkout)
	jobs:
	build:
	runs-on: ubuntu-24.04
	steps:
	- name: Check out software-layer repository
	uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1

	- name: set up Python
	uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0
	with:
	python-version: '3.9'

	- name: Check software licenses
	run: \|
	python licenses/spdx.py licenses/licenses.json

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