Add spdx3-validate to examples validation workflow #1432

	on: pull_request

	jobs:
	validate:
	name: Validate build
	runs-on: ubuntu-latest
	steps:
	- name: Checkout spdx-spec
	uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 #v4.2.1
	with:
	fetch-depth: 1
	- name: Set up specific Python version
	uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3 #v5.2.0
	with:
	python-version: "3.12"
	cache: "pip"
	- name: Install pre-requisites
	run: pip install -r requirements.txt
	- name: Build the site to validate (use mkdocs.yml, no model files, no PDF export)
	run: ENABLE_PDF_EXPORT=0 mkdocs build --clean --verbose
	# To validate the PR from within spdx-spec repo, build using mkdocs.yml
	# (no model files) and without the time-consuming PDF export

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