ceph: change required pattern for pull realm endpoint

Ensure that the endpoint for the pull realm spec
starts with "http" or "https". Also update
object-multisite-pull-realm(-test).yaml with
updated comments.

Signed-off-by: Ali Maredia <amaredia@redhat.com>

cluster/examples/kubernetes/ceph/object-multisite-pull-realm-test.yaml

@@ -20,8 +20,12 @@ metadata:
   namespace: rook-ceph-secondary
 spec:
   # This endpoint in this section needs is an endpoint from the master zone in the master zone group of realm-a. See object-multisite.md for more details.
+  # This value must include http(s):// at the beginning
+  # ex:
+  #   pull:
+  #     endpoint: http://10.103.133.16:80
   pull:
-    endpoint: http://10.103.133.16:80
+    endpoint: <endpoint>
 ---
 apiVersion: ceph.rook.io/v1
 kind: CephObjectZoneGroup

cluster/examples/kubernetes/ceph/object-multisite-pull-realm.yaml

@@ -21,8 +21,12 @@ metadata:
   namespace: rook-ceph-secondary
 spec:
   # This endpoint in this section needs is an endpoint from the master zone in the master zone group of realm-a. See object-multisite.md for more details.
+  # This value must include http(s):// at the beginning
+  # ex:
+  #   pull:
+  #     endpoint: http://10.103.133.16:80
   pull:
-    endpoint: http://10.103.133.16:80
+    endpoint: <endpoint>
 ---
 apiVersion: ceph.rook.io/v1
 kind: CephObjectZoneGroup

pkg/apis/ceph.rook.io/v1/types.go

@@ -1469,6 +1469,7 @@ type ObjectRealmSpec struct {
 
 // PullSpec represents the pulling specification of a Ceph Object Storage Gateway Realm
 type PullSpec struct {
+        // +kubebuilder:validation:Pattern=`^https*://`
 	Endpoint string `json:"endpoint"`
 }