Add script which list staged releases

Motivation:

When finish the release process we need to give the id of the staged release. Let's add a script for that

Modifications:

Add script which allows to show all staged releases

Result:

No need to login into sonatype anymore

scripts/list_staged_release.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -e
+
+RC_LIST=$(mvn org.sonatype.plugins:nexus-staging-maven-plugin:rc-list -DserverId=sonatype-nexus-staging -DnexusUrl=https://oss.sonatype.org | grep -A 2 "\[INFO\] ID                   State    Description")
+STAGED=$(echo "$RC_LIST" | grep 'OPEN' | cut -f 2 -d ' ')
+echo "$STAGED"