feat(be): add migration for new limit option

db/Migration.go

@@ -57,6 +57,7 @@ func GetMigrations() []Migration {
 		{Version: "2.8.40"},
 		{Version: "2.8.42"},
 		{Version: "2.8.51"},
+		{Version: "2.8.57"},
 	}
 }
 

db/Task.go

@@ -29,7 +29,7 @@ type Task struct {
 	// override variables
 	Playbook    string `db:"playbook" json:"playbook"`
 	Environment string `db:"environment" json:"environment"`
-	Limit       string `db:"limit" json:"limit"`
+	Limit       string `db:"hosts_limit" json:"limit"`
 
 	UserID *int `db:"user_id" json:"user_id"`
 

db/sql/migrations/v2.8.57.sql

@@ -0,0 +1 @@
+alter table `task` add column `hosts_limit` varchar(255) not null default '';