split up the flake better

flake.nix

@@ -20,21 +20,9 @@
     serverProject = inputs.pyproject-nix.lib.project.loadPyproject {
       projectRoot = ./.;
     };
-  in {
-    # devShells.${system}.default = pkgs.mkShell {
-    #   packages = with pkgs; [
-    #     python313
-    #     python313Packages.flask
-    #     python313Packages.waitress
-    #   ];
-    #
-    #   shellHook = ''
-    #     python --version
-    #     exec zsh
-    #   '';
-    # };
-    packages.${system} = let
-      scanbuddy = pkgs.writeShellApplication {
+
+    # Packages
+    script = pkgs.writeShellApplication {
       name = "scanbuddy";
 
       runtimeInputs = with pkgs; [sane-backends brscan5 ghostscript];
@@ -48,13 +36,50 @@
       // {
         env.CUSTOM_ENVVAR = "foobar";
       });
-    in {
-      default = pkgs.symlinkJoin {
+
+    scanbuddy-pkg = pkgs.symlinkJoin {
       name = "scanbuddy";
-        paths = [scanbuddy server];
+      paths = [script server];
     };
-      inherit scanbuddy;
+  in {
+    # devShells.${system}.default = pkgs.mkShell {
+    #   packages = with pkgs; [
+    #     python313
+    #     python313Packages.flask
+    #     python313Packages.waitress
+    #   ];
+    #
+    #   shellHook = ''
+    #     python --version
+    #     exec zsh
+    #   '';
+    # };
+    packages.${system} = {
+      default = scanbuddy-pkg;
+      inherit script;
       inherit server;
     };
+
+    nixosModules.default = {
+      config,
+      pkgs,
+      lib,
+      ...
+    }: {
+      options = {
+        service.scanbuddy = lib.mkEnableOption "Enable the scanbuddy server";
+      };
+      config = {
+        systemd.services.scanbuddy = lib.mkIf config.service.scanbuddy {
+          description = "The scanbuddy webservice";
+          wantedBy = ["multi-user.target"];
+          serviceConfig = {
+            ExecStart = "${scanbuddy-pkg}/bin/scanbuddy-server";
+            Path = ["${scanbuddy-pkg}/bin"];
+            WorkingDirectory = "/var/lib/scanbuddy";
+          };
+        };
+      };
+    };
   };
 }

pyproject.toml

@@ -6,6 +6,7 @@ description = "A REST server for the scanbuddy shell-script"
 # define any Python dependencies
 dependencies = [
   "flask>3",
+  "waitress"
 ]
 
 # define the CLI executable