Add timeout command for not very powerful SBCs

src/freedombone-app-pleroma

     run_system_query_postgresql "GRANT ALL ON ALL tables IN SCHEMA public TO pleroma;"
     run_system_query_postgresql "GRANT ALL ON ALL sequences IN SCHEMA public TO pleroma;"
     run_system_query_postgresql "CREATE EXTENSION citext;"
+    run_system_query_postgresql "set statement_timeout to 20000;"
 
     read_config_param "PLEROMA_SECRET_KEY"
     if [ ${#PLEROMA_SECRET_KEY} -lt 50 ]; then