vesktop: fix darwin build (#489725)

pkgs/by-name/ve/vesktop/package.nix

@@ -87,12 +87,6 @@ stdenv.mkDerivation (finalAttrs: {
     ELECTRON_SKIP_BINARY_DOWNLOAD = 1;
   };
 
-  # disable code signing on macos
-  # https://github.com/electron-userland/electron-builder/blob/77f977435c99247d5db395895618b150f5006e8f/docs/code-signing.md#how-to-disable-code-signing-during-the-build-process-on-macos
-  postConfigure = lib.optionalString stdenv.hostPlatform.isDarwin ''
-    export CSC_IDENTITY_AUTO_DISCOVERY=false
-  '';
-
   # electron builds must be writable
   preBuild = ''
     # Validate electron version matches upstream package.json
@@ -119,7 +113,8 @@ stdenv.mkDerivation (finalAttrs: {
       --dir \
       -c.asarUnpack="**/*.node" \
       -c.electronDist=${if stdenv.hostPlatform.isDarwin then "." else "electron-dist"} \
-      -c.electronVersion=${electron.version}
+      -c.electronVersion=${electron.version} \
+      ${lib.optionalString stdenv.hostPlatform.isDarwin "-c.mac.identity=null"} # disable code signing on macos, https://github.com/electron-userland/electron-builder/blob/77f977435c99247d5db395895618b150f5006e8f/docs/code-signing.md#how-to-disable-code-signing-during-the-build-process-on-macos
 
     runHook postBuild
   '';