Bump actions/cache from 3 to 4 #540

	# Licensed to the Apache Software Foundation (ASF) under one or more
	# contributor license agreements. See the NOTICE file distributed with
	# this work for additional information regarding copyright ownership.
	# The ASF licenses this file to You under the Apache License, Version 2.0
	# (the "License"); you may not use this file except in compliance with
	# the License. You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	---
	name: linkcheck

	on: [push, pull_request] # yamllint disable-line rule:truthy


	#
	# NOTE: these paths are referenced in start-build-env.sh
	#

	jobs:
	linkcheck:
	runs-on: ubuntu-latest
	steps:
	- name: checkout
	uses: actions/checkout@v4
	- name: maven cache
	uses: actions/cache@v4
	with:
	path: ~/.m2
	key: yetus-m2-${{ hashFiles('**/pom.xml') }}
	- name: test
	run: ./start-build-env.sh ./website-tester.sh

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