chore: Add assertions for missing Sentry environment variables

scripts/postinstall.ts

@@ -1,11 +1,18 @@
 import 'dotenv/config';
 import fs from 'fs';
 import path from 'path';
+import assert from 'assert';
 
 // Load environment variables from .env file
 const {SENTRY_AUTH_TOKEN, SENTRY_DSN, SENTRY_ORG, SENTRY_PROJECT, SENTRY_URL} =
   process.env;
 
+assert(SENTRY_AUTH_TOKEN, 'Missing SENTRY_AUTH_TOKEN');
+assert(SENTRY_DSN, 'Missing SENTRY_DSN');
+assert(SENTRY_ORG, 'Missing SENTRY_ORG');
+assert(SENTRY_PROJECT, 'Missing SENTRY_PROJECT');
+assert(SENTRY_URL, 'Missing SENTRY_URL');
+
 // Write environment variables to files
 console.log('Writing environment variables to files...');