Track usage data via Google Analytics 4

This config setting is used by the tech docs gem to add GA4 usage
tracking via the Google Tag Manager approach when users consent

Author: yndajas

config/tech-docs.yml

@@ -25,3 +25,6 @@ prevent_indexing: false
 
 # Generate the API reference
 api_path: https://raw.githubusercontent.com/alphagov/content-store/refs/heads/main/openapi.yaml
+
+# Track usage
+ga4_gtm_tracking_id: GTM-TB4X2Z34