ci: add verification workflow

next.config.ts

@@ -41,6 +41,9 @@ const nextConfig: NextConfig = {
   },
 };
 
+const shouldUploadSentrySourcemaps =
+  process.env.CI !== "true" || process.env.SENTRY_UPLOAD_SOURCEMAPS === "1";
+
 export default withSentryConfig(withSerwist(nextConfig), {
  // For all available options, see:
  // https://www.npmjs.com/package/@sentry/webpack-plugin#options
@@ -52,12 +55,21 @@ export default withSentryConfig(withSerwist(nextConfig), {
  // Only print logs for uploading source maps in CI
  silent: !process.env.CI,
 
+ // Keep build metadata local; application errors/performance are configured separately.
+ telemetry: false,
+
  // For all available options, see:
  // https://docs.sentry.io/platforms/javascript/guides/nextjs/manual-setup/
 
  // Upload a larger set of source maps for prettier stack traces (increases build time)
  widenClientFileUpload: true,
 
+ // PR/branch CI should validate builds without uploading source maps. Release jobs can
+ // set SENTRY_UPLOAD_SOURCEMAPS=1 to enable uploads explicitly.
+ sourcemaps: {
+   disable: !shouldUploadSentrySourcemaps,
+ },
+
  // Uncomment to route browser requests to Sentry through a Next.js rewrite to circumvent ad-blockers.
  // This can increase your server load as well as your hosting bill.
  // Note: Check that the configured route will not match with your Next.js middleware, otherwise reporting of client-