style: Switch to nixfmt from nixpkgs-fmt

Most of the ecosystem has moved to this formatter,
and many people configured their editors to autoformat it with this formatter.

Closes: https://git.snix.dev/snix/snix/issues/62
Change-Id: Icf39e7836c91fc2ae49fbe22a40a639105bfb0bd
Reviewed-on: https://cl.snix.dev/c/snix/+/30671
Reviewed-by: Florian Klink <flokli@flokli.de>
Tested-by: besadii
Autosubmit: Ilan Joselevich <personal@ilanjoselevich.com>

ops/secrets/default.nix

@@ -1,3 +1,5 @@
 args:
-let mkSecrets = import ./mkSecrets.nix args; in
+let
+  mkSecrets = import ./mkSecrets.nix args;
+in
 mkSecrets ./. (import ./secrets.nix) // { inherit mkSecrets; }

ops/secrets/mkSecrets.nix

@@ -12,10 +12,12 @@ let
   agePubkey = types.typedef "age pubkey" (s: isString s && hasPrefix "age" s);
 
   agenixSecret = types.struct "agenixSecret" {
-    publicKeys = types.listOf (types.union [
-      sshPubkey
-      agePubkey
-    ]);
+    publicKeys = types.listOf (
+      types.union [
+        sshPubkey
+        agePubkey
+      ]
+    );
   };
 
 in

ops/secrets/secrets.nix

@@ -20,13 +20,21 @@ let
 
   superadmins = raito ++ edef ++ flokli;
 
-  allDefault.publicKeys = superadmins ++ [ gerrit01 public01 build01 meta01 ];
+  allDefault.publicKeys = superadmins ++ [
+    gerrit01
+    public01
+    build01
+    meta01
+  ];
   terraform.publicKeys = superadmins;
   gerrit01Default.publicKeys = superadmins ++ [ gerrit01 ];
   public01Default.publicKeys = superadmins ++ [ public01 ];
   build01Default.publicKeys = superadmins ++ [ build01 ];
   meta01Default.publicKeys = superadmins ++ [ meta01 ];
-  ciDefault.publicKeys = superadmins ++ [ gerrit01 build01 ];
+  ciDefault.publicKeys = superadmins ++ [
+    gerrit01
+    build01
+  ];
 in
 {
   "grafana-agent-password.age" = allDefault;