Extract plugin info for SBT builds

Change-Id: Ic62fc0ac09507e0ff9d8bdacbdd04be800079105
diff --git a/jenkins/gerrit-sbt-build-plugin.sh b/jenkins/gerrit-sbt-build-plugin.sh
index c073256..a040278 100644
--- a/jenkins/gerrit-sbt-build-plugin.sh
+++ b/jenkins/gerrit-sbt-build-plugin.sh
@@ -22,4 +22,7 @@
   jar ufm $jar MANIFEST.MF && rm MANIFEST.MF
 
   echo "$PLUGIN_VERSION" > $jar-version
+
+  curl -L https://gerrit-review.googlesource.com/projects/plugins%2F{name}/config | \
+     tail -n +2 > $(dirname $jar)/$(basename $jar .jar).json
 done