Add release artifact download helper

Author: jdaugherty

etc/bin/download-release-artifacts.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+#
+#  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
+#
+#    https://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.
+#
+set -e
+
+PROJECT_NAME='grails-spring-security'
+REPO_NAME='apache/grails-spring-security'
+RELEASE_TAG=$1
+DOWNLOAD_LOCATION="${2:-downloads}"
+
+if [ -z "${RELEASE_TAG}" ]; then
+  echo "Usage: $0 [release-tag] <optional download location>"
+  exit 1
+fi
+
+echo "Downloading files to ${DOWNLOAD_LOCATION}"
+mkdir -p "${DOWNLOAD_LOCATION}"
+
+VERSION=${RELEASE_TAG#v}
+
+# Source distro
+curl -L -o "${DOWNLOAD_LOCATION}/apache-${PROJECT_NAME}-$VERSION-incubating-src.zip" "https://github.com/${REPO_NAME}/releases/download/$RELEASE_TAG/apache-${PROJECT_NAME}-$VERSION-incubating-src.zip"
+curl -L -o "${DOWNLOAD_LOCATION}/apache-${PROJECT_NAME}-$VERSION-incubating-src.zip.asc" "https://github.com/${REPO_NAME}/releases/download/$RELEASE_TAG/apache-${PROJECT_NAME}-$VERSION-incubating-src.zip.asc"
+curl -L -o "${DOWNLOAD_LOCATION}/apache-${PROJECT_NAME}-$VERSION-incubating-src.zip.sha512" "https://github.com/${REPO_NAME}/releases/download/$RELEASE_TAG/apache-${PROJECT_NAME}-$VERSION-incubating-src.zip.sha512"