app/views/application/_analytics.html.erb
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', '<%= ENV.fetch("GOOGLE_ANALYTICS_KEY", nil) %>', 'auto');
ga('send', 'pageview');
</script>
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=<%= ENV.fetch("GOOGLE_ANALYTICS_MEASUREMENT_ID", nil) %>"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', '<%= ENV.fetch("GOOGLE_ANALYTICS_MEASUREMENT_ID", nil) %>', {
cookie_flags: 'max-age=7200;secure;samesite=none'
});
</script>