add user soft delete

Signed-off-by: Christian Richter <c.richter@opencloud.eu>

services/graph/pkg/config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"context"
+	"time"
 
 	"github.com/opencloud-eu/opencloud/pkg/shared"
 )
@@ -39,6 +40,8 @@ type Config struct {
 	Context context.Context `yaml:"-"`
 
 	Metadata Metadata `yaml:"metadata_config"`
+
+	UserSoftDeleteRetentionTime time.Duration `yaml:"user_soft_delete_retention_time" env:"GRAPH_USER_SOFT_DELETE_RETENTION_TIME" desc:"The time after which a soft-deleted user is permanently deleted. If set to 0 (default), there is no soft delete retention time and users are deleted immediately after being soft-deleted. If set to a positive value, the user will be kept in the system for that duration before being permanently deleted." introductionVersion:"%%NEXT%%"`
 }
 
 type Spaces struct {