flake: add flake-parts without moving attributes

This commit adds flake-parts and does minimal enabling without moving
any of the attributes into their "proper" locations yet.

flake.lock

@@ -59,6 +59,24 @@
         "type": "github"
       }
     },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1673047662,
+        "narHash": "sha256-dXYxH/0Ea5oQSkGAWWNy7HzmFutguycDGn2dt6lTYRQ=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "aa1f6ca773b6e740037ebfb35f7010e0c3960638",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1667395993,
@@ -90,6 +108,24 @@
         "type": "github"
       }
     },
+    "nixpkgs-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1672350804,
+        "narHash": "sha256-jo6zkiCabUBn3ObuKXHGqqORUMH27gYDIFFfLq5P4wg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "677ed08a50931e38382dbef01cba08a8f7eac8f6",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-test": {
       "locked": {
         "lastModified": 1671812130,
@@ -110,6 +146,7 @@
       "inputs": {
         "crane": "crane",
         "flake-compat": "flake-compat_2",
+        "flake-parts": "flake-parts",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
         "nixpkgs-test": "nixpkgs-test",

flake.nix

@@ -5,6 +5,12 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
     nixpkgs-test.url = "github:RaitoBezarius/nixpkgs/simplified-qemu-boot-disks";
 
+    flake-parts.url = "github:hercules-ci/flake-parts";
+
+    # We only have this input to pass it to other dependencies and
+    # avoid having mulitple versions in our dependencies.
+    flake-utils.url = "github:numtide/flake-utils";
+
     crane = {
       url = "github:ipetkov/crane";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -22,11 +28,11 @@
       url = "github:edolstra/flake-compat";
       flake = false;
     };
-    flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, nixpkgs-test, crane, rust-overlay, ... }:
+  outputs = inputs@{ self, nixpkgs, nixpkgs-test, crane, rust-overlay, flake-parts, ... }:
-    let
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      flake = let
         pkgs = import nixpkgs {
           system = "x86_64-linux";
           overlays = [
@@ -153,4 +159,13 @@
             lanzabooteModule = self.nixosModules.lanzaboote;
           });
         };
+
+      systems = [
+        "x86_64-linux"
+      ];
+
+      perSystem = { config, ... }: {
+        # Nothing here yet.
+      };
+    };
 }