Add flake config pinned at 22.11

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669052418,
+        "narHash": "sha256-M1I4BKXBQm2gey1tScemEh5TpHHE3gKptL7BpWUvL8s=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "20fc948445a6c22d4e8d5178e9a6bc6e1f5417c8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "20fc948445a6c22d4e8d5178e9a6bc6e1f5417c8",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,12 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs?rev=20fc948445a6c22d4e8d5178e9a6bc6e1f5417c8";
+  };
+
+  outputs = { self, nixpkgs }: {
+    nixosConfigurations.catacomb = nixpkgs.lib.nixosSystem {
+      system = "aarch64-linux";
+      modules = [ ./configuration.nix ];
+    };
+  };
+}