Add version updater feature

Added a version updater component that frequently checks for updates to the app and alerts the user if necessary. This requires a new route, config changes, and additional UI resources. A new feature flag 'enableVersionUpdater' has been added in the feature-flags.config.ts file to toggle this feature.

apps/web/app/version/route.ts

@@ -0,0 +1,38 @@
+/**
+ * We force it to static because we want to cache for as long as the build is live.
+ */
+export const dynamic = 'force-static';
+
+// please provide your own implementation
+// if you're not using Vercel or Cloudflare Pages
+const KNOWN_GIT_ENV_VARS = [
+  'CF_PAGES_COMMIT_SHA',
+  'VERCEL_GIT_COMMIT_SHA',
+  'GIT_HASH',
+];
+
+export const GET = async () => {
+  const currentGitHash = await getGitHash();
+
+  return new Response(currentGitHash, {
+    headers: {
+      'content-type': 'text/plain',
+    },
+  });
+};
+
+function getGitHash() {
+  for (const envVar of KNOWN_GIT_ENV_VARS) {
+    if (process.env[envVar]) {
+      return process.env[envVar];
+    }
+  }
+
+  return getHashFromProcess();
+}
+
+async function getHashFromProcess() {
+  const { execSync } = await import('child_process');
+
+  return execSync('git log --pretty=format:"%h" -n1').toString().trim();
+}