make core an unecessary profile and add to suites

Prevents mkHosts subverting standard devos api to import core and add
all necessary core features to mkHosts, so core can be safely deleted in
suites

lib/devos/mkHosts.nix

@@ -12,7 +12,6 @@ let
   ];
 
   modules = {
-    core = "${self}/profiles/core";
     modOverrides = { config, overrideModulesPath, ... }:
       let
         inherit (overrides) modules disabledModules;
@@ -32,6 +31,7 @@ let
         extraSpecialArgs = extern.userSpecialArgs // { suites = suites.user; };
         sharedModules = extern.userModules ++ (builtins.attrValues self.homeModules);
       };
+      users.mutableUsers = lib.mkDefault false;
 
       hardware.enableRedistributableFirmware = lib.mkDefault true;
 
@@ -49,6 +49,8 @@ let
         override.flake = inputs.override;
       };
 
+      nix.package = pkgs.nixFlakes;
+
       nix.extraOptions = ''
         experimental-features = ${lib.concatStringsSep " "
           experimentalFeatures

profiles/core/default.nix

@@ -2,7 +2,6 @@
 let inherit (lib) fileContents;
 in
 {
-  nix.package = pkgs.nixFlakes;
 
   nix.systemFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
 
@@ -145,6 +144,4 @@ in
 
   services.earlyoom.enable = true;
 
-  users.mutableUsers = false;
-
 }

suites/default.nix

@@ -2,7 +2,7 @@
 
 {
   system = with profiles; rec {
-    base = [ users.nixos users.root ];
+    base = [ core users.nixos users.root ];
   };
   user = with userProfiles; rec {
     base = [ direnv git ];