iceshrimp: does not fail to build but doesn't work

modules/fedi/iceshrimp/iceshrimp.nix

@@ -1,21 +1,31 @@
 {
   stdenv,
-  fetchFromGitea,
+  fetchurl,
+  zstd,
+  gnutar,
 }: let
   version = "v2025.1-beta5.patch2.security1";
 in
   stdenv.mkDerivation {
     name = "iceshrimp";
-    src = fetchFromGitea {
-      domain = "https://iceshrimp.dev";
-      owner = "iceshrimp";
-      repo = "Iceshrimp.NET";
-      rev = version;
-      hash = "";
+    src = fetchurl {
+      url = "https://iceshrimp.dev/iceshrimp/Iceshrimp.NET/releases/download/v2025.1-beta5.patch2.security1/Iceshrimp.NET-${version}-linux-amd64-glibc.tar.zst";
+      hash = "sha256-Uwstie81M3kM9CjukIG+wXpxp91uTuXFMB/fZlFWsMk=";
     };
 
-    installPhase = ''
+    nativeBuildInputs = [
+      zstd
+      gnutar
+    ];
+
+    unpackPhase = ''
+      runHook preUnpack
+
       mkdir -p $out
-      make
+
+      tar xf $src
+      cp -r * $out
+
+      runHook postUnpack
     '';
   }