add branch dimensional data to GA

config.toml

@@ -30,4 +30,6 @@ enableGitInfo = true
         tabWidth = 4
     [markup.goldmark.renderer]
         unsafe= true
-
+[security]
+  [security.funcs]
+    getenv = ['^HUGO_', '^BRANCH']

layouts/partials/head.html

@@ -82,3 +82,8 @@
   <!-- End Meta Pixel Code -->
 </head>
 {{ template "_internal/google_analytics.html" . }}
+<script>
+  ga('send', 'pageview', {
+    'Branch':  '{{ getenv "BRANCH" }}'
+  });
+</script>