feature toggle for using maintenance windows (#3074)

* feature toggle for using maintenance windows

charts/postgres-operator/crds/operatorconfigurations.yaml

@@ -79,6 +79,9 @@ spec:
               enable_lazy_spilo_upgrade:
                 type: boolean
                 default: false
+              enable_maintenance_windows:
+                type: boolean
+                default: true
               enable_pgversion_env_var:
                 type: boolean
                 default: true

charts/postgres-operator/values.yaml

@@ -27,6 +27,8 @@ configGeneral:
   - "all"
   # update only the statefulsets without immediately doing the rolling update
   enable_lazy_spilo_upgrade: false
+  # toogle to use maintenance windows feature
+  enable_maintenance_windows: true
   # set the PGVERSION env var instead of providing the version via postgresql.bin_dir in SPILO_CONFIGURATION
   enable_pgversion_env_var: true
   # start any new database pod without limitations on shm memory