chore: try to reorganize a bit - doesn't work imported in local flake

flake.nix

@@ -18,45 +18,43 @@
         pkgs = import nixpkgs {
           inherit system;
         };
+        spacetime = pkgs.stdenv.mkDerivation {
+          pname = "spacetimedb";
+          version = "1.0.1";
+          src = pkgs.fetchurl {
+            url = "https://github.com/clockworklabs/SpacetimeDB/releases/download/v1.1.0/spacetime-x86_64-unknown-linux-gnu.tar.gz";
+            hash = "sha256-t7V4TkPWQfzH8PUkRLq1OMaKhZ4in4EZCLKinc2oSik=";
+          };
+          nativeBuildInputs = with pkgs; [
+            autoPatchelfHook
+          ];
 
-        stdenv = pkgs.stdenv;
+          buildInputs = with pkgs; [
-        lib = pkgs.lib;
+            libgcc
-        fetchurl = pkgs.fetchurl;
+            stdenv.cc.cc.lib
-        autoPatchelfHook = pkgs.autoPatchelfHook;
+          ];
-        libgcc = pkgs.libgcc;
+
+          unpackPhase = ''
+            runHook preUnpack
+            mkdir -p $out/bin
+            tar -xvf $src -C $out/bin
+            runHook postUnpack
+          '';
+
+          installPhase = ''
+            runHook preInstall
+            runHook postInstall
+          '';
+        };
       in
       {
         packages = {
-          default = stdenv.mkDerivation {
+          spacetimedb = spacetime;
-            pname = "spacetimedb";
+          default = spacetime;
-            version = "1.0.1";
-            src = fetchurl {
-              url = "https://github.com/clockworklabs/SpacetimeDB/releases/download/v1.1.0/spacetime-x86_64-unknown-linux-gnu.tar.gz";
-              hash = "sha256-t7V4TkPWQfzH8PUkRLq1OMaKhZ4in4EZCLKinc2oSik=";
-            };
-            nativeBuildInputs = [ autoPatchelfHook ];
-
-            buildInputs = [
-              libgcc
-              stdenv.cc.cc.lib
-            ];
-
-            unpackPhase = ''
-              runHook preUnpack
-              mkdir -p $out/bin
-              tar -xvf $src -C $out/bin
-              runHook postUnpack
-            '';
-
-            installPhase = ''
-              runHook preInstall
-              runHook postInstall
-            '';
-          };
         };
         devShells = {
           default = pkgs.mkShell {
-            buildInputs = [ self.${system}.packages.default ];
+            buildInputs = [ spacetime ];
           };
         };
       }