Add Permissions-Policy response header to opt out of Google FLoC

www-swagg.pl

@@ -29,6 +29,10 @@ under sub {
     # Pass in the expiration for plain-text cookie
     $c->stash(sessionLife => $sessionLife);
 
+    # Opt out of Google FLoC
+    # https://paramdeo.com/blog/opting-your-website-out-of-googles-floc-network
+    $c->res->headers->header('Permissions-Policy', 'interest-cohort=()');
+
     1;
 };