Redirect blob requests to CDN

Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>

roles/httpd/reverseproxy/templates/reversepassproxy.registry.conf

@@ -3,9 +3,8 @@ RequestHeader set X-Scheme https early
 RequestHeader set X-Forwarded-Proto https early
 ProxyPreserveHost On
 
-{% if env == "maybe-in-staging" %}
-RewriteRule ^/v2/([a-zA-Z]*)/blobs/([a-zA-Z]*) https://ourregistry/v2/$1/blobs/$2 [R]
-{% endif %}
+RewriteCond %{HTTP:VIA} !cdn77
+RewriteRule ^/v2/([a-zA-Z]*)/blobs/([a-zA-Z]*) https://cdn.registry.fedoraproject.org/v2/$1/blobs/$2 [R]
 
 # This is terible, but Docker.
 RewriteEngine on