Announce build_meta.json and simplify scripts

release_gen/announce_build_meta.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+if [ ! $# -eq 1 ]
+  then
+    echo "Usage: ./announce_build_meta.sh <releaserepo>"
+    echo ""
+    echo "releaserepo: Release repository on github - e.g. jcefmaven/jcefmaven"
+    exit 1
+fi
+
+#Announce build_meta.json to other jobs
+(
+  echo "build_meta=https://github.com/$1/releases/download/"
+  cat release_tag.txt
+  echo "/build_meta.json"
+) | awk '{print}' ORS='' >> $GITHUB_ENV
+echo "" >> $GITHUB_ENV