health (#310)

src/pages/health.tsx

@@ -0,0 +1,16 @@
+import * as React from 'react'
+import type { PageProps } from 'gatsby'
+
+const HealthPage: React.FC<PageProps> = () => {
+  // Check user agent on the client side
+  React.useEffect(() => {
+    const userAgent = window.navigator.userAgent
+    if (userAgent !== 'service-status') {
+      window.location.href = '/'
+    }
+  }, [])
+
+  return <div>OK</div>
+}
+
+export default HealthPage