core: rgw realm pull spec is optional

The endpoint on the rgw realm pull spec is causing a failure
if not specified even when it is not expected to be
required. Now the endpoint has the json property to be
ommitted if not specified.

Signed-off-by: Travis Nielsen <tnielsen@redhat.com>

deploy/charts/rook-ceph/templates/resources.yaml

@@ -7338,11 +7338,7 @@ spec:
                     endpoint:
                       pattern: ^https*://
                       type: string
-                  required:
-                    - endpoint
                   type: object
-              required:
-                - pull
               type: object
             status:
               description: Status represents the status of an object

deploy/examples/crds.yaml

@@ -7331,11 +7331,7 @@ spec:
                     endpoint:
                       pattern: ^https*://
                       type: string
-                  required:
-                    - endpoint
                   type: object
-              required:
-                - pull
               type: object
             status:
               description: Status represents the status of an object

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

@@ -1568,13 +1568,13 @@ type CephObjectRealmList struct {
 
 // ObjectRealmSpec represent the spec of an ObjectRealm
 type ObjectRealmSpec struct {
-	Pull PullSpec `json:"pull"`
+	Pull PullSpec `json:"pull,omitempty"`
 }
 
 // PullSpec represents the pulling specification of a Ceph Object Storage Gateway Realm
 type PullSpec struct {
 	// +kubebuilder:validation:Pattern=`^https*://`
-	Endpoint string `json:"endpoint"`
+	Endpoint string `json:"endpoint,omitempty"`
 }
 
 // CephObjectZoneGroup represents a Ceph Object Store Gateway Zone Group