fix(ci): center-crop non-square logos before tauri icon generation

tauri icon requires a square source image. Uploaded logos like 727x721
caused Prepare template to fail. Use sharp to center-crop to square
before generating platform icons.

Co-authored-by: ShuMengya <shumengya666@outlook.com>

.github/scripts/prepare-template.mjs

@@ -99,6 +99,6 @@ if (fs.existsSync(androidConfPath)) {
   patchTauriConfig(androidConfPath);
 }
 
-generateAppIcons({ jobId });
+await generateAppIcons({ jobId });
 
 console.log("Template prepared successfully");