flake: create generator for aarch64 sdcard image

flake.lock

@@ -351,6 +351,42 @@
         "type": "github"
       }
     },
+    "nixlib": {
+      "locked": {
+        "lastModified": 1636849918,
+        "narHash": "sha256-nzUK6dPcTmNVrgTAC1EOybSMsrcx+QrVPyqRdyKLkjA=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "28a5b0557f14124608db68d3ee1f77e9329e9dd5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "nixos-generators": {
+      "inputs": {
+        "nixlib": "nixlib",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1657748715,
+        "narHash": "sha256-WecDwDY/hEcDQYzFnccCNa+5Umht0lfjx/d1qGDy/rQ=",
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "rev": "3323b944d99b026aebfd8de439e001409dde067d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "type": "github"
+      }
+    },
     "nixos-hardware": {
       "locked": {
         "lastModified": 1654057797,
@@ -610,6 +646,7 @@
         "multitask": "multitask",
         "neovim-nightly": "neovim-nightly",
         "nix-gaming": "nix-gaming",
+        "nixos-generators": "nixos-generators",
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-porcupine": "nixpkgs-porcupine",