ELK Nightly CI #1434

	# Runs ELK's build and tests every night.
	# This is helpful to detect general build errors,
	# since PRs are not blocked by unsuccesful 'ci.yml' builds
	# and direct pushes to master are allowed.
	name: ELK Nightly CI

	on:
	schedule:
	- cron: '00 03 * * *'

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	# We check LTS versions and the latest release
	# 11 - LTS
	# 17 - LTS
	java-version: [ 11, 17 ]

	steps:
	# Checkout the reposity of both elk and elk-models (the latter is required for the tests)
	- uses: actions/checkout@v4
	with:
	path: elk
	- uses: actions/checkout@v4
	with:
	repository: eclipse/elk-models
	path: elk-models
	# Prepare and use a cache for maven
	- uses: actions/cache@v4
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-maven-
	- name: Set up Java version ${{ matrix.java-version }}
	uses: actions/setup-java@v4
	with:
	distribution: 'zulu'
	java-version: ${{ matrix.java-version }}
	- name: Build and verify with maven
	# Run mvn in the 'build' folder
	working-directory: /home/runner/work/elk/elk/elk/build/
	# As line breaks do not seem to be supported, env variables are used as workaround to make the mvn call readable
	run: mvn $opts $doc $test $test_models clean verify
	env:
	opts: --fail-at-end --no-transfer-progress
	doc: --define elk.metadata.documentation.outputPath=/home/runner/work/elk/elk/elk/docs
	test: --define tests.paths.elk-repo=/home/runner/work/elk/elk/elk
	test_models: --define tests.paths.models-repo=/home/runner/work/elk/elk/elk-models

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