feat(nix): add nix build

flake.nix

@@ -7,6 +7,8 @@
     { self, ... }@inputs:
 
     let
+      pname = "spotiflac-cli";
+      version = "7.0.9";
       goVersion = 24; # Change this to update the whole stack
 
       supportedSystems = [
@@ -26,6 +28,18 @@
             };
           }
         );
+
+      pkgs = import inputs.nixpkgs {
+        system = "x86_64-linux";
+        overlays = [ inputs.self.overlays.default ];
+      };
+
+      spotiflac = pkgs.fetchFromGitHub {
+        owner = "afkarxyz";
+        repo = "SpotiFLAC";
+        tag = "v${version}";
+        hash = "sha256-VHYof17C+eRoZfssXRQpbB8GXlcfPhyRiWltM6yDqe0=";
+      };
     in
     {
       overlays.default = final: prev: {
@@ -43,5 +57,26 @@
           };
         }
       );
+      packages = forEachSupportedSystem (
+        { pkgs }:
+        {
+          default = pkgs.buildGoModule (finalAttrs: {
+            inherit pname version;
+            src = ./.;
+            vendorHash = "sha256-EpGgfiCqJjHEOphV2x8FmXeIFls7eq2NVxb/or4NLUo=";
+
+            subPackages = [
+              "."
+            ];
+
+            postPatch = ''
+              cp -r ${spotiflac} ./SpotiFLAC/
+              sed -i "s/git clone https:\/\/github.com\/afkarxyz\/SpotiFLAC.git//g" ./tools/fetch_spotiflac_backend.sh
+              sed -i "s/rm -rf SpotiFLAC//g" ./tools/fetch_spotiflac_backend.sh
+              ./tools/fetch_spotiflac_backend.sh
+            '';
+          });
+        }
+      );
     };
 }