feat: add gtm to vueapp (#8154)

.env.example

@@ -176,6 +176,9 @@ ANDROID_SHA256_CERT_FINGERPRINT=AC:73:8E:DE:EB:56:EA:CC:10:87:02:A7:65:37:7B:38:
 # MICROSOFT CLARITY
 # MS_CLARITY_TOKEN=xxxxxxxxx
 
+# GOOGLE_TAG_MANAGER
+# GOOGLE_TAG = GTM-XXXXXXX
+
 ## Scout
 ## https://scoutapm.com/docs/ruby/configuration
 # SCOUT_KEY=YOURKEY

app/views/layouts/vueapp.html.erb

@@ -93,5 +93,14 @@
           })(window, document, 'clarity', 'script', '<%= ENV.fetch('MS_CLARITY_TOKEN', '') %>');
       </script>
     <% end %>
+    <% if ENV.fetch('GOOGLE_TAG', nil).present? %>
+    <script>
+    (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+        j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+        'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+        })(window,document,'script','dataLayer', '<%= ENV.fetch('GOOGLE_TAG', '') %>');
+    </script>
+    <% end %>
   </body>
 </html>