feat(gs/system): Init roswell

An ec2 node I'm using as a remote dev box

Change-Id: I7d81371ecdc11d6c1b5bc06d1b4f55de534d25ad
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2244
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>

users/glittershark/system/home/modules/common.nix

@@ -74,6 +74,12 @@
         hostname = "172.16.0.5";
         forwardAgent = true;
       };
+
+      "roswell" = {
+        host = "roswell";
+        hostname = "18.223.118.13";
+        forwardAgent = true;
+      };
     };
   };