add build configs

.gitignore

@@ -1,3 +1,4 @@
 /target
 .devenv
 .direnv
+/result

flake.nix

@@ -65,5 +65,21 @@
           })
         ];
       };
+      packages.default = let
+        toolchain = inputs.fenix.packages.${system}.minimal.toolchain;
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+        (pkgs.makeRustPlatform {
+          cargo = toolchain;
+          rustc = toolchain;
+        })
+        .buildRustPackage {
+          pname = "chatthing";
+          version = "0.1.0";
+          src = ./.;
+          builtInputs = [pkgs.libpqxx pkgs.openssl];
+          nativeBuildInputs = [pkgs.pkg-config];
+          cargoLock.lockFile = ./Cargo.lock;
+        };
     });
 }