Specify dependencies on other services for matrix authentication service

Fixes matrix authentication service crashing on startup after a host reboot
because the network is down.

config/hosts/matrix/matrix-authentication-service.nix

@@ -78,6 +78,9 @@ in
 
   systemd.services.matrix-authentication-service = {
     description = "Matrix Authentication Service";
+    after = [ "network-online.target" "postgresql.service" ];
+    requires = [ "postgresql.service" ];
+    wants = [ "network-online.target" ];
 
     serviceConfig = {
       Type = "simple";