Add group-instance-announcement-create permission

Author: Miner28

openapi/components/schemas/GroupPermissions.yaml

@@ -27,6 +27,7 @@ enum:
   - group-members-viewall
   - group-roles-assign
   - group-roles-manage
+  - group-instance-announcement-create
 x-enum-varnames:
   - group_all
   - group_announcement_manage
@@ -54,3 +55,4 @@ x-enum-varnames:
   - group_members_viewall
   - group_roles_assign
   - group_roles_manage
+  - group-instance-announcement-create