drawio: remove usage of CSC_IDENTITY_AUTO_DISCOVERY

pkgs/by-name/dr/drawio/package.nix

@@ -64,19 +64,18 @@ stdenv.mkDerivation (finalAttrs: {
   buildPhase = ''
     runHook preBuild
 
-  ''
-  + lib.optionalString stdenv.hostPlatform.isDarwin ''
-    cp -R ${electron.dist}/Electron.app Electron.app
-    chmod -R u+w Electron.app
-    export CSC_IDENTITY_AUTO_DISCOVERY=false
+    electron_dist="$(mktemp -d)"
+    cp -r ${electron.dist}/. "$electron_dist"
+    chmod -R u+w "$electron_dist"
+
     sed -i "/afterSign/d" electron-builder-linux-mac.json
-  ''
-  + ''
+
     npm exec electron-builder -- \
       --dir \
-      ${lib.optionalString stdenv.hostPlatform.isDarwin "--config electron-builder-linux-mac.json --config.mac.identity=null"} \
-      -c.electronDist=${if stdenv.hostPlatform.isDarwin then "." else electron.dist} \
-      -c.electronVersion=${electron.version}
+      --config electron-builder-linux-mac.json \
+      -c.electronDist="$electron_dist" \
+      -c.electronVersion=${electron.version} \
+      -c.mac.identity=null
 
     runHook postBuild
   '';