Add data volume for auditlog ETL

Added data volume to mount optional configuration files (i.e.: author type)

Change-Id: Ib35e49683c43f2193c396cf824a45deeb33ce182

build.sbt

diff --git a/build.sbt b/build.sbt
index 838b788..82e72f8 100644
--- a/build.sbt
+++ b/build.sbt
@@ -37,6 +37,7 @@
         .copy(baseDirectory(_ / "scripts" / "gerrit-analytics-etl-auditlog.sh").value, file(s"$entryPointBase/gerrit-analytics-etl-auditlog.sh"))
         .copy(baseDirectory(_ / "scripts" / "wait-for-elasticsearch.sh").value, file(s"$entryPointBase/wait-for-elasticsearch.sh"))
         .volume(s"$entryPointBase/events/")
+        .volume(s"$entryPointBase/data/")
         .cmd(s"/bin/sh", s"$entryPointBase/gerrit-analytics-etl-auditlog.sh")
     }
   )