Need to put config in `nixos`

mastodon-container.nix

@@ -74,7 +74,6 @@ in {
         project.name = "mastodon";
         services = {
           mastodon = { pkgs, ... }: {
-            useSystemd = true;
             service = {
               restart = "always";
               volumes = [
@@ -83,6 +82,8 @@ in {
                 "mastodon-data:/var/lib/mastodon"
               ];
             };
+            nixos = {
+              useSystemd = true;
               configuration = {
                 boot.tmp.useTmpfs = true;
                 system.nssModules = mkForce [ ];
@@ -110,6 +111,7 @@ in {
             };
           };
         };
+      };
     in { imports = [ image ]; };
 
     services.nginx = {