feat(nix): added nix derivation

.envrc

@@ -0,0 +1 @@
+use flake;

default.nix

@@ -0,0 +1,28 @@
+{ lib, buildGoModule, gcc, pkg-config, libopus, ffmpeg, opusfile  }: buildGoModule {
+  pname = "komputer";
+  version = "v1.0.0";
+
+  src = ./.;
+
+  vendorHash = "sha256-TAbmS8xYqleXIU0cCRiJVyC93jiXiLuLepMD4WcS7IQ=";
+
+  nativeBuildInputs = [ gcc pkg-config libopus ];
+
+  CGO_ENABLED = 1;
+
+  proxyVendor = true;
+
+  preBuild = ''
+    go get layeh.com/gopus
+  '';
+
+  propagatedBuildInputs = [ ffmpeg opusfile ];
+
+  meta = with lib; {
+    homepage = "https://github.com/Wittano/komputer";
+    description = "Discord bot behave as like 'komputer'. One of character in Star Track parody series created by Dem3000";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ Wittano ];
+    platforms = platforms.linux;
+  };
+}

flake.nix

@@ -0,0 +1,32 @@
+{
+  description = "komputer - discord bot";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+      pkgs = import nixpkgs {
+        system = "x86_64-linux";
+      };
+
+      lib = nixpkgs.lib.extend (self: super: {
+        my = import ./lib { inherit pkgs; lib = self; };
+      });
+    in rec {
+      inherit lib;
+
+      packages.x86_64-linux.komputer = pkgs.callPackage ./default.nix {};
+
+      defaultPackage.x86_64-linux = self.packages.x86_64-linux.komputer;
+
+      devShell = pkgs.mkShell {
+        packages = with pkgs; [
+          go
+          ffmpeg
+          rnix-lsp
+          nixfmt
+          nixpkgs-fmt
+        ];
+      };
+    };
+}