fix: Encoding of private key of env variables (#9127)

Author: HazAT

app/changelog/%5Fadmin/upload/route.tsx

@@ -23,7 +23,7 @@ const handler = async function handler(req: NextRequest) {
     projectId: process.env.GOOGLE_PROJECT_ID,
     credentials: {
       client_email: process.env.GOOGLE_CLIENT_EMAIL,
-      private_key: process.env.GOOGLE_PRIVATE_KEY,
+      private_key: `${process.env.GOOGLE_PRIVATE_KEY}`.split(String.raw`\n`).join('\n'),
     },
   });
   const bucket = storage.bucket(`${process.env.GOOGLE_BUCKET_NAME}`);