When creating backup from schedule, allow default name (#2569)

* When creating backup from schedule, allow default name

Signed-off-by: Christoph Blecker <admin@toph.ca>

pkg/apis/velero/v1/schedule.go

@@ -16,7 +16,12 @@ limitations under the License.
 
 package v1
 
-import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+import (
+	"fmt"
+	"time"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
 
 // ScheduleSpec defines the specification for a Velero schedule
 type ScheduleSpec struct {
@@ -95,3 +100,8 @@ type ScheduleList struct {
 
 	Items []Schedule `json:"items"`
 }
+
+// TimestampedName returns the default backup name format based on the schedule
+func (s *Schedule) TimestampedName(timestamp time.Time) string {
+	return fmt.Sprintf("%s-%s", s.Name, timestamp.Format("20060102150405"))
+}