feat: add template RBAC/groups (#4235)

coderd/users.go

@@ -1032,6 +1032,11 @@ func (api *API) CreateUser(ctx context.Context, store database.Store, req Create
 			}
 			req.OrganizationID = organization.ID
 			orgRoles = append(orgRoles, rbac.RoleOrgAdmin(req.OrganizationID))
+
+			_, err = tx.InsertAllUsersGroup(ctx, organization.ID)
+			if err != nil {
+				return xerrors.Errorf("create %q group: %w", database.AllUsersGroup, err)
+			}
 		}
 
 		params := database.InsertUserParams{