set log level to DEBUG for dev versions

app/Dockerfile

@@ -30,10 +30,13 @@ ARG SERVICE_NAME
 ARG VERSION
 ARG UID
 ARG GID
+ARG LOG_LVL
+
 ENV VERSION=$VERSION
 ENV SERVICE_NAME=$SERVICE_NAME
 ENV UID=$UID
 ENV GID=$GID 
+ENV LOG_LVL=$LOG_LVL
 
     
 # set the working directory in the container