do not reset secrets of standby clusters (#3044)

* do not reset secrets of standby clusters
align error message with unit test
* check for other env vars, too

pkg/cluster/util.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"net/http"
 	"reflect"
+	"regexp"
 	"sort"
 	"strings"
 	"time"
@@ -663,6 +664,16 @@ func parseResourceRequirements(resourcesRequirement v1.ResourceRequirements) (ac
 	return resources, nil
 }
 
+func isStandbyCluster(spec *acidv1.PostgresSpec) bool {
+	for _, env := range spec.Env {
+		hasStandbyEnv, _ := regexp.MatchString(`^STANDBY_WALE_(S3|GS|GSC|SWIFT)_PREFIX$`, env.Name)
+		if hasStandbyEnv && env.Value != "" {
+			return true
+		}
+	}
+	return spec.StandbyCluster != nil
+}
+
 func (c *Cluster) isInMaintenanceWindow(specMaintenanceWindows []acidv1.MaintenanceWindow) bool {
 	if len(specMaintenanceWindows) == 0 && len(c.OpConfig.MaintenanceWindows) == 0 {
 		return true