Adds additional URLs to allowlist

Author: Steven Smith

modules/configuring-firewall.adoc

@@ -62,6 +62,18 @@ If your environment has a dedicated load balancer in front of your {product-titl
 |443
 |Provides core container images
 
+|`cdn04.quay.io`
+|443
+|Provides core container images
+
+|`cdn05.quay.io`
+|443
+|Provides core container images
+
+|`cdn06.quay.io`
+|443
+|Provides core container images
+
 |`sso.redhat.com`
 |443
 |The `https://console.redhat.com` site uses authentication from `sso.redhat.com`