feat: nix module

container/flake.nix

@@ -0,0 +1,49 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+  # inputs.trictrac.url = "github:mmai/trictrac";
+  inputs.trictrac.url = "..";
+  inputs.rust-overlay.url = "github:oxalica/rust-overlay";
+
+  outputs = { self, nixpkgs, trictrac, rust-overlay }:
+    {
+      nixosConfigurations = {
+
+        container = nixpkgs.lib.nixosSystem {
+          system = "x86_64-linux";
+
+          modules = [
+            trictrac.nixosModule
+            ({ pkgs, ... }:
+              let
+                hostname = "trictrac";
+              in
+              {
+                boot.isContainer = true;
+
+                # Let 'nixos-version --json' know about the Git revision
+                # of this flake.
+                system.configurationRevision = nixpkgs.lib.mkIf (self ? rev) self.rev;
+                system.stateVersion = "25.11";
+
+                # Network configuration.
+                networking.useDHCP = false;
+                networking.firewall.allowedTCPPorts = [ 80 ];
+                networking.hostName = hostname;
+
+                # rust-overlay must be applied first so trictrac.overlay can use rust-bin
+                nixpkgs.overlays = [ rust-overlay.overlays.default trictrac.overlay ];
+
+                services.trictrac = {
+                  enable = true;
+                  protocol = "http";
+                  hostname = hostname;
+                };
+
+                environment.systemPackages = with pkgs; [ neovim ];
+              })
+          ];
+        };
+
+      };
+    };
+}