Fix: change tasks.task_data column type to longblob in mysql (#2418)

Fix #2206 

Changes are copied and adapted from #1050

server/model/task.go

@@ -29,7 +29,7 @@ type TaskStore interface {
 // Task defines scheduled pipeline Task.
 type Task struct {
 	ID           string                 `json:"id"           xorm:"PK UNIQUE 'task_id'"`
-	Data         []byte                 `json:"data"         xorm:"'task_data'"`
+	Data         []byte                 `json:"data"         xorm:"LONGBLOB 'task_data'"`
 	Labels       map[string]string      `json:"labels"       xorm:"json 'task_labels'"`
 	Dependencies []string               `json:"dependencies" xorm:"json 'task_dependencies'"`
 	RunOn        []string               `json:"run_on"       xorm:"json 'task_run_on'"`

server/store/datastore/migration/023_task_data_type.go

@@ -0,0 +1,37 @@
+// Copyright 2023 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package migration
+
+import (
+	"xorm.io/xorm"
+	"xorm.io/xorm/schemas"
+)
+
+var alterTableTasksUpdateColumnTaskDataType = task{
+	name: "alter-table-tasks-update-type-of-task-data",
+	fn: func(sess *xorm.Session) (err error) {
+		dialect := sess.Engine().Dialect().URI().DBType
+
+		switch dialect {
+		case schemas.MYSQL:
+			_, err = sess.Exec("ALTER TABLE tasks MODIFY COLUMN task_data LONGBLOB")
+		default:
+			// xorm uses the same type for all blob sizes in sqlite and postgres
+			return nil
+		}
+
+		return err
+	},
+}

server/store/datastore/migration/migration.go

@@ -55,6 +55,7 @@ var migrationTasks = []*task{
 	&parentStepsToWorkflows,
 	&addOrgs,
 	&addOrgID,
+	&alterTableTasksUpdateColumnTaskDataType,
 }
 
 var allBeans = []interface{}{