Ingress: clear X-Frame-Options header from responses.

This enables applications to be loaded in iframes. Although it does
sacrifice security a bit.

https: //developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
Change-Id: Ibb5568b5461bbe001106724a0cf64ec25e7fd4ce
diff --git a/core/installer/values-tmpl/private-network.cue b/core/installer/values-tmpl/private-network.cue
index bc58a9f..156b078 100644
--- a/core/installer/values-tmpl/private-network.cue
+++ b/core/installer/values-tmpl/private-network.cue
@@ -84,7 +84,11 @@
 					controllerValue: "k8s.io/\(_ingressPrivate)"
 				}
 				config: {
+					"proxy-body-size": "200M" // TODO(giolekva): configurable
 					"force-ssl-redirect": "true"
+					"server-snippet": """
+					more_clear_headers "X-Frame-Options";
+					"""
 				}
 				extraArgs: {
 					"default-ssl-certificate": "\(_ingressPrivate)/cert-wildcard.\(global.privateDomain)"