nix: add flake-compat

Signed-off-by: Ruby Iris Juric <[e-mail]>

default.nix

···
+# Default setup from https://git.lix.systems/lix-project/flake-compat
+
+let
+  lockFile = builtins.fromJSON (builtins.readFile ./flake.lock);
+  flake-compat-node = lockFile.nodes.${lockFile.nodes.root.inputs.flake-compat};
+  flake-compat = builtins.fetchTarball {
+    inherit (flake-compat-node.locked) url;
+    sha256 = flake-compat-node.locked.narHash;
+  };
+
+  flake = (
+    import flake-compat {
+      src = ./.;
+    }
+  );
+in
+  flake.defaultNix

flake.lock

···
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1751685974,
+        "narHash": "sha256-NKw96t+BgHIYzHUjkTK95FqYRVKB8DHpVhefWSz/kTw=",
+        "rev": "549f2762aebeff29a2e5ece7a7dc0f955281a1d1",
+        "type": "tarball",
+        "url": "https://git.lix.systems/api/v1/repos/lix-project/flake-compat/archive/549f2762aebeff29a2e5ece7a7dc0f955281a1d1.tar.gz?rev=549f2762aebeff29a2e5ece7a7dc0f955281a1d1"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://git.lix.systems/lix-project/flake-compat/archive/main.tar.gz"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
···
     },
     "root": {
       "inputs": {
+        "flake-compat": "flake-compat",
         "gomod2nix": "gomod2nix",
         "htmx-src": "htmx-src",
         "htmx-ws-src": "htmx-ws-src",

flake.nix

···
       url = "github:nix-community/gomod2nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    flake-compat = {
+      url = "https://git.lix.systems/lix-project/flake-compat/archive/main.tar.gz";
+      flake = false;
+    };
     indigo = {
       url = "github:oppiliappan/indigo";
       flake = false;
···
     inter-fonts-src,
     sqlite-lib-src,
     ibm-plex-mono-src,
+    ...
   }: let
     supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
     forAllSystems = nixpkgs.lib.genAttrs supportedSystems;