Add a tag to the heimdall container

This correctly labels it in the system logs otherwise you only see the id

modules/heimdall/default.nix

@@ -18,6 +18,7 @@
       ];
       extraOptions = [
         ''--mount=type=volume,source=heimdall,target=/config,volume-driver=local,volume-opt=type=nfs,volume-opt=device=:/server_data/heimdall,"volume-opt=o=addr=10.7.89.108,rw,nfsvers=4.0,nolock,hard,noatime"''
+        "--log-opt=tag='heimdall'"
       ];
     };
   };