Run CI under JDK 21 and 22 #656

	name: Java CI with Gradle

	on: [push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-latest

	strategy:
	matrix:
	java: [ '11', '17', '21' ]

	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 1
	show-progress: false
	- name: Set up JDK
	uses: actions/setup-java@v4
	with:
	distribution: 'temurin'
	java-version: ${{ matrix.java }}
	- name: ./gradlew build javadoc
	run: ./gradlew build
	- name: ./gradlew requireJavadoc
	run: ./gradlew requireJavadoc
	- name: ./gradlew spotlessCheck
	run: ./gradlew spotlessCheck

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