Update backup registry secret name (#3054)

* Update backup registry secret name

Signed-off-by: dkwon17 <dakwon@redhat.com>

* Update modules/administration-guide/pages/devworkspace-backup-regular-oci-registry.adoc

Co-authored-by: Gaurav Trivedi <90042568+gtrivedi88@users.noreply.github.com>

* Update modules/administration-guide/pages/devworkspace-backup-regular-oci-registry.adoc

Co-authored-by: Gaurav Trivedi <90042568+gtrivedi88@users.noreply.github.com>

* Add warning about auth secret copy functionality

Signed-off-by: David Kwon <dakwon@redhat.com>

---------

Signed-off-by: dkwon17 <dakwon@redhat.com>
Signed-off-by: David Kwon <dakwon@redhat.com>
Co-authored-by: Gaurav Trivedi <90042568+gtrivedi88@users.noreply.github.com>

Author: dkwon17

modules/administration-guide/pages/devworkspace-backup-regular-oci-registry.adoc

@@ -26,26 +26,31 @@ config:
     backupCronJob:
       enable: true
       registry:
-        authSecret: my-secret
+        authSecret: devworkspace-backup-registry-auth
         path: quay.io/my-company-org
       schedule: '0 */4 * * *'
     imagePullPolicy: Always
 ----
 <1> For Red Hat OpenShift, the default installation namespace for the {devworkspace} operator is `openshift-operators`. See the xref:devworkspace-operator.adoc[{devworkspace} operator overview].
 
-The `authSecret` must point to a real {kubernetes} Secret of type `kubernetes.io/dockerconfigjson` containing credentials to access the registry.
+The `authSecret` must be named `devworkspace-backup-registry-auth`. It must reference a {kubernetes} Secret of type `kubernetes.io/dockerconfigjson` that contains credentials to access the registry.
 The secret should be created in the installation {namespace} for the {devworkspace} operator.
 
 To create one, you can use the following command:
 
 [source,shell,subs="+attributes,+quotes"]
 ----
-kubectl create secret docker-registry my-secret --from-file=config.json
+{orch-cli} create secret docker-registry devworkspace-backup-registry-auth --from-file=config.json
 ----
 
 The secret must contain a label `controller.devfile.io/watch-secret=true` to be recognized by the {devworkspace} Operator.
 
 [source,shell,subs="+attributes,+quotes"]
 ----
-kubectl label secret my-secret controller.devfile.io/watch-secret=true
+kubectl label secret devworkspace-backup-registry-auth controller.devfile.io/watch-secret=true
 ----
+
+[WARNING]
+====
+The {devworkspace} Operator copies the `devworkspace-backup-registry-auth` secret to each {devworkspace} {namespace} so that backups from user workspaces can be pushed to the registry. If you do not want that secret copied automatically, create a `devworkspace-backup-registry-auth` secret with user-specific credentials in each {devworkspace} {namespace} instead.
+====