Explain terms LU and LG, refs #18 #12

	# This is a basic workflow to help you get started with Actions

	name: CI – Pull Requests

	# Controls when the action will run. Triggers the workflow on push or pull request
	# events but only for the main branch
	on:
	pull_request:
	branches: [ main ]
	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	build:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- name: checkout source
	uses: actions/checkout@v3
	with:
	submodules: recursive
	- name: Verify Gradle Wrapper
	uses: gradle/wrapper-validation-action@v1
	- name: Set up JDK 17
	uses: actions/setup-java@v3
	with:
	distribution: 'temurin'
	java-version: 17
	- name: Execute Gradle Build
	uses: gradle/gradle-build-action@v2
	with:
	gradle-version: wrapper
	arguments: buildDocs
	- name: Upload Build Artifacts
	uses: actions/upload-artifact@v3
	with:
	name: curriculum files (PDF and HTML)
	path: \|
	build/*.pdf
	build/*.html
	retention-days: 10

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