Only do OCSP stapling on the proxies

The actual cache is only set in the proxy HTTP config.
While we could set the cache path in the other servers' configs as well,
that would be a significantly larger change.

Signed-off-by: Patrick Uiterwijk <patrick@puiterwijk.org>

roles/httpd/website/templates/website.conf

@@ -57,7 +57,9 @@
 {% endif %}
 
   SSLEngine on
-  SSLUseStapling on
+  {% if ansible_hostname.startswith('proxy') %}
+    SSLUseStapling on
+  {% endif %}
 {% if certbot %}
   SSLCertificateFile /etc/pki/tls/certs/{{ site_name }}.cert
   SSLCertificateKeyFile /etc/pki/tls/private/{{ site_name }}.key