nix: move experimental-features to system/nix.nix

All hosts had identical nix-command/flakes settings in their
configuration.nix. Centralize in system/nix.nix so new hosts
(like pn01/pn02) get it automatically.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hosts/garage01/configuration.nix

@@ -54,10 +54,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/ha1/configuration.nix

@@ -46,10 +46,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/http-proxy/configuration.nix

@@ -52,10 +52,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   vault.enable = true;
   homelab.deploy.enable = true;
 

hosts/jelly01/configuration.nix

@@ -44,10 +44,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/kanidm01/configuration.nix

@@ -55,10 +55,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/monitoring02/configuration.nix

@@ -53,10 +53,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/nats1/configuration.nix

@@ -44,10 +44,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/nix-cache02/configuration.nix

@@ -53,10 +53,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/ns1/configuration.nix

@@ -58,10 +58,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/ns2/configuration.nix

@@ -58,10 +58,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/template2/configuration.nix

@@ -54,10 +54,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   nix.settings.substituters = [
     "https://nix-cache.home.2rjus.net"

hosts/testvm01/configuration.nix

@@ -55,10 +55,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/testvm02/configuration.nix

@@ -55,10 +55,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/testvm03/configuration.nix

@@ -55,10 +55,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

hosts/vault01/configuration.nix

@@ -45,10 +45,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

scripts/create-host/templates/configuration.nix.j2

@@ -56,10 +56,7 @@
   };
   time.timeZone = "Europe/Oslo";
 
-  nix.settings.experimental-features = [
+
-    "nix-command"
-    "flakes"
-  ];
   nix.settings.tarball-ttl = 0;
   environment.systemPackages = with pkgs; [
     vim

system/nix.nix

@@ -31,6 +31,10 @@ in
     };
 
     settings = {
+      experimental-features = [
+        "nix-command"
+        "flakes"
+      ];
       trusted-substituters = [
         "https://nix-cache.home.2rjus.net"
         "https://cache.nixos.org"