Adds a script used to prepare a release for vote

Script used to download the release from a staged repo and validate the
checkums and signature and create a new .sha512 hash for the release
bits

etc/scripts/prepare-release.sh

@@ -0,0 +1,96 @@
+#!/bin/sh
+# 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.
+
+# Setting the script to fail if anything goes wrong
+set -e
+
+#This is a script to help with the release process
+
+
+error () {
+   echo ""
+   echo "$@"
+   echo ""
+   echo "Usage: ./prepare-release.sh repo-url version"
+   echo ""
+   echo "example:"
+   echo "./prepare-release.sh https://repo1.maven.org/maven2 5.15.0"
+   echo ""
+   exit 64
+}
+
+doDownload () {
+
+  repoPath="$1"
+  theFile="$2"
+  completeURL="$repoPath/$theFile"
+
+  echo
+  echo $theFile
+
+  echo "Downloading $completeURL"
+  curl $completeURL > $theFile
+
+  echo "Downloading $theFile.asc"
+  curl $completeURL.asc > $theFile.asc
+
+  echo "Downloading $theFile.md5"
+  curl $completeURL.md5 > $theFile.md5
+
+  echo "Verifying signature $theFile.asc"
+  gpg --verify $theFile.asc
+
+  echo "Augmenting $theFile.md5 with filename details"
+  echo "  $theFile" >> $theFile.md5
+
+  echo "Generating SHA512 checksum file $theFile.sha512"
+  sha512sum $theFile > $theFile.sha512
+}
+
+if [ "$#" != 2 ]; then
+  error "Cannot match arguments"
+fi
+
+release=$2
+target="activemq-$2"
+
+if [ -d $target ]; then
+  cd $target
+else
+  echo "Directory $target does not exist, creating"
+  mkdir $target
+  cd $target
+fi
+
+binRepoURL="$1/org/apache/activemq/apache-activemq/$2"
+srcRepoURL="$1/org/apache/activemq/activemq-parent/$2"
+
+doDownload $srcRepoURL activemq-parent-$release-source-release.zip 
+doDownload $binRepoURL apache-activemq-$release-bin.zip
+doDownload $binRepoURL apache-activemq-$release-bin.tar.gz
+
+echo ""
+echo "--- Download Complate for Release $2 Artifacts are in $target---"
+echo ""
+echo "Validating all MD5 checksum files"
+md5sum -c *.md5
+
+echo "Validating all SHA512 checksum files"
+sha512sum -c *.sha512
+
+