Revert "Specify the systems through a flake input."

The flake input does not seem to work well with garnix.

This reverts commit 7db9cbff4e.

flake.lock

@@ -35,9 +35,7 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "systems": [
-          "systems"
-        ]
+        "systems": "systems"
       },
       "locked": {
         "lastModified": 1683635384,
@@ -71,9 +69,7 @@
     },
     "flake-utils": {
       "inputs": {
-        "systems": [
-          "systems"
-        ]
+        "systems": "systems_2"
       },
       "locked": {
         "lastModified": 1681202837,
@@ -176,7 +172,6 @@
         "nixpkgs": "nixpkgs",
         "pre-commit-hooks": "pre-commit-hooks",
         "rust-overlay": "rust-overlay",
-        "systems": "systems",
         "treefmt-nix": "treefmt-nix"
       }
     },
@@ -204,16 +199,33 @@
       }
     },
     "systems": {
-      "flake": false,
       "locked": {
-        "lastModified": 1,
-        "narHash": "sha256-8wkkYGr1dPSnX9oVMX8D6dTOROXKOYpBTKfriA0sEBI=",
-        "path": "./systems.nix",
-        "type": "path"
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
       },
       "original": {
-        "path": "./systems.nix",
-        "type": "path"
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
       }
     },
     "treefmt-nix": {

flake.nix

@@ -1,19 +1,11 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    systems = {
-      url = "path:./systems.nix";
-      flake = false;
-    };
-    flake-utils = {
-      url = "github:numtide/flake-utils";
-      inputs.systems.follows = "systems";
-    };
+    flake-utils.url = "github:numtide/flake-utils";
     devshell = {
       url = "github:numtide/devshell";
       inputs = {
         nixpkgs.follows = "nixpkgs";
-        systems.follows = "systems";
       };
     };
     pre-commit-hooks = {
@@ -54,7 +46,7 @@
     , devshell
     , treefmt-nix
     , pre-commit-hooks
-    , ...
+    ,
     }:
     {
       lib = import ./nix/lib.nix {
@@ -68,7 +60,11 @@
       };
     }
     //
-    (flake-utils.lib.eachDefaultSystem
+    (flake-utils.lib.eachSystem
+      [
+        flake-utils.lib.system.x86_64-linux
+        flake-utils.lib.system.aarch64-linux
+      ]
       (system:
       let
         pkgs = import nixpkgs {

systems.nix

@@ -1,4 +0,0 @@
-[
-  "x86_64-linux"
-  "aarch64-linux"
-]