Adds `UnitHeightAboveGrade` element #421

	name: Test Schemas

	on:
	push:
	branches: [ master ]
	pull_request:
	types: [ synchronize, opened ]
	workflow_dispatch:

	jobs:
	test-xsd:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: 3.9
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r tests/requirements.txt
	- name: Test with pytest
	run: \|
	pytest tests

	flatten-xsd:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	ref: ${{ github.head_ref }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install lxml
	- name: Install software
	shell: bash
	run: \|
	export DEBIAN_FRONTEND=noninteractive
	sudo apt update
	sudo -E apt-get install -y libxml2-utils
	- name: Flatten XSD
	run: \|
	cd schemas
	python ../scripts/xsdflatten.py HPXML.xsd ../merged_schema/HPXMLMerged.xsd
	- name: Commit XSD
	run: \|
	branch_name="${{ github.head_ref }}"
	git pull origin $branch_name
	git add merged_schema/HPXMLMerged.xsd
	git status
	if [[ $(git diff --cached --exit-code) ]]; then
	git config --global user.email "github-action@users.noreply.github.com"
	git config --global user.name "GitHub Action"
	git commit -m "Latest HPXMLMerged.xsd"
	echo "Pushing to branch: $branch_name"
	git push -u origin $branch_name
	fi
	- name: Validate XSD
	run: \|
	export XSDPATH=merged_schema/HPXMLMerged.xsd
	xmllint --schema $XSDPATH examples/audit.xml --noout

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