major improvements on purity

etcnixos/common.nix

@@ -14,9 +14,19 @@
     ./distrobox.nix
     ./vm.nix
 
+    inputs.agenix.nixosModules.default
     inputs.nixos-hardware.nixosModules.common-pc-ssd
   ];
 
+  nixpkgs.config.allowUnfreePredicate =
+    pkg:
+    builtins.elem (lib.getName pkg) [
+      "steam"
+      "steam-original"
+      "steam-unwrapped"
+      "steam-run"
+    ];
+
   nix = {
     # optimize the store
     optimise.automatic = true;
@@ -59,6 +69,7 @@
     kernelModules = [
       "ip_tables"
       "iptable_nat"
+      "msr"
     ];
   };