remove cachix from pkgs

Signed-off-by: Harald Hoyer <harald@hoyer.xyz>

modules/home/cli-apps/home-manager/default.nix

@@ -26,7 +26,6 @@ in
 
     home.packages = with pkgs; [
       vim
-      cachix
     ];
   };
 }

modules/nixos/services/base/default.nix

@@ -33,7 +33,6 @@ in
       systemPackages = with pkgs; [
         age
         bash
-        cachix
         cifs-utils
         clevis
         delta
@@ -133,6 +132,8 @@ in
         "nixpkgs"
         "--update-input"
         "unstable"
+        "--no-write-lock-file"
+        "-L"
       ];
       flake = "git+https://git.hoyer.xyz/harald/nixcfg";
     };