CLDC-1620 Extract GTM IDs to helper

app/helpers/analytics_helper.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module AnalyticsHelper
+  def get_gtm_container
+    # Additional environments tbc
+    "GTM-M6GS7FF"
+  end
+
+  def get_gtm_id
+    # Additional environments tbc
+    "G-1RH26G5KVP"
+  end
+end

app/views/layouts/application.html.erb

@@ -22,8 +22,8 @@
     <%= javascript_include_tag "vendor/polyfill-output-value.js" %>
     <%= javascript_include_tag "vendor/outerHTML.js" %>
 
-    <% gtm_container = "GTM-M6GS7FF" %>
-    <% gtm_id = "G-1RH26G5KVP" %>
+    <% gtm_container = get_gtm_container %>
+    <% gtm_id = get_gtm_id %>
 
     <!-- Google Tag Manager (doesn't store personal info until permission given) -->
     <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':