update the flake

flake.nix

@@ -1,7 +1,7 @@
 {
   description = "Declaratively update your data.";
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-  outputs = { nixpkgs, ... }: let
+  outputs = { self, nixpkgs, ... }: let
     system = "x86_64-linux";
     pkgs = import nixpkgs { inherit system; };
     package = pkgs.stdenv.mkDerivation rec {
@@ -11,22 +11,46 @@
       src = ./.;
       deps = pkgs.callPackage ./build.zig.zon.nix {};
       nativeBuildInputs = [ pkgs.zig.hook pkgs.libgit2 pkgs.gpgme ];
-      zigBuildFlags = [ "--system" "${deps}" ];
+      zigBuildFlags = [
+        "--system" "${deps}"
+        "-Doptimize=Debug"
+      ];
     };
-    in {
+  in {
     lib = builtins.import ./lib.nix { pkgs = pkgs; };
     nixosModules = rec {
       fooud = { pkgs, lib, config, inputs, ... }: {
         options.programs.fooud.enable = lib.mkEnableOption ("fooud")
           // { default = true; };
         config = lib.mkIf config.programs.fooud.enable {
-          environment.systemPackages = [ pkgs.libgit2 pkgs.gpgme package ];
+          environment.systemPackages = [
+            pkgs.libgit2
+            pkgs.gpgme
+            pkgs.nix
+            package
+          ];
         };
       };
       default = fooud;
     };
-
-    # just x86 for now
     packages.${system} = rec { default = package; fooud = default; };
+
+    checks.${system}.build = let
+      package = self.packages.${system}.default;
+    in pkgs.runCommand "fooud-build" { buildInputs = [
+        pkgs.git
+        pkgs.nix
+      ]; } ''
+        mkdir repo
+        git -C repo init > /dev/null 2>&1
+        echo "hi" > repo/README.md
+        git -C repo config user.email "you@example.com" > /dev/null 2>&1
+        git -C repo config user.name "Your Name" > /dev/null 2>&1
+        git -C repo add . > /dev/null 2>&1
+        git -C repo commit -m "initial commit" > /dev/null 2>&1
+
+        # this check won't succeed until I find a way to run a chroot store
+        ${package}/bin/fooud --git repo --dest test
+        '';
   };
 }