fix: add reader as accepted rgw role (#390)

Co-authored-by: Mohammed Naser <mnaser@vexxhost.com>
diff --git a/roles/rook_ceph_cluster/vars/main.yml b/roles/rook_ceph_cluster/vars/main.yml
index c0b9c57..fe95008 100644
--- a/roles/rook_ceph_cluster/vars/main.yml
+++ b/roles/rook_ceph_cluster/vars/main.yml
@@ -51,7 +51,7 @@
     rgw_keystone admin domain = service
     rgw_keystone admin project = service
     rgw keystone implicit tenants = true
-    rgw keystone accepted roles = member,admin
+    rgw keystone accepted roles = member,admin,reader
     rgw_keystone accepted admin roles = admin
     rgw keystone token cache size = 0
     rgw s3 auth use keystone = true