Fix ro-k8s charm to include commonkey

Change-Id: I869b09709585c0cd1cbdd067d6837c94348872b6
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charm/ro-k8s/reactive/ro.py b/installers/charm/ro-k8s/reactive/ro.py
index 094812f..aef1bea 100644
--- a/installers/charm/ro-k8s/reactive/ro.py
+++ b/installers/charm/ro-k8s/reactive/ro.py
@@ -207,6 +207,7 @@
         {
             "OSMRO_DATABASE_URI": mongodb_uri,
             "OSMRO_MESSAGE_HOST": kafka_host,
+            "OSMRO_DATABASE_COMMONKEY": cfg.get("database_commonkey"),
         }
     )
     return spec