[FLINK-34746] Switching to the Apache CDN for Dockerfile #156

	# 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: "CI"

	on: [push, pull_request]

	env:
	FLINK_TAR_URL: "https://s3.amazonaws.com/flink-nightly/flink-1.18-SNAPSHOT-bin-scala_2.12.tgz"

	jobs:
	ci:
	name: CI using JDK ${{ matrix.java_version }}
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	java_version: [ 8, 11, 17 ]
	steps:
	- uses: actions/checkout@v4
	- name: "Build images"
	run: \|
	./add-custom.sh -u "$FLINK_TAR_URL" -j ${{ matrix.java_version }} -n "test-java${{ matrix.java_version }}"
	- name: "Test images"
	run: testing/run_tests.sh

Provide feedback