fix: cron generator to support hourly interval

internal/helpers/helpers_cron.go

@@ -114,11 +114,11 @@ func ConvertCrontab(namespace, cron string) (string, error) {
 						continue
 					}
 				}
-				match3, _ := regexp.MatchString("^(H|\\*)/([0-2]?[0-9])$", val)
+				match3, _ := regexp.MatchString("^(H|\\*)/([01]?[0-9]|2[0-3])$", val)
 				if match3 {
-					// A Minute like H/15 or */15 is defined, create a list of hours with a random start
+					// An hour like H/15 or */15 is defined, create a list of hours with a random start
 					// like 1,7,13,19
-					params := getCaptureBlocks("^(?P<P1>H|\\*)/(?P<P2>[0-2]?[0-9])$", val)
+					params := getCaptureBlocks("^(?P<P1>H|\\*)/(?P<P2>[01]?[0-9]|2[0-3])$", val)
 					step, err := strconv.Atoi(params["P2"])
 					if err != nil {
 						return "", fmt.Errorf("cron definition '%s' is invalid, unable to determine hours value", cron)