Increase Content field size of gpg_key_import to MEDIUMTEXT (#22897)

Unfortunately #20896 does not completely prevent Data too long issues
and GPGKeyImport needs to be increased too.

Fix #22896

Signed-off-by: Andrew Thornton <art27@cantab.net>

models/asymkey/gpg_key_import.go

@@ -23,7 +23,7 @@ import "code.gitea.io/gitea/models/db"
 // GPGKeyImport the original import of key
 type GPGKeyImport struct {
 	KeyID   string `xorm:"pk CHAR(16) NOT NULL"`
-	Content string `xorm:"TEXT NOT NULL"`
+	Content string `xorm:"MEDIUMTEXT NOT NULL"`
 }
 
 func init() {

models/migrations/migrations.go

@@ -457,6 +457,8 @@ var migrations = []Migration{
 	NewMigration("Add actions tables", v1_19.AddActionsTables),
 	// v241 -> v242
 	NewMigration("Add card_type column to project table", v1_19.AddCardTypeToProjectTable),
+	// v242 -> v243
+	NewMigration("Alter gpg_key_import content TEXT field to MEDIUMTEXT", v1_19.AlterPublicGPGKeyImportContentFieldToMediumText),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v1_19/v242.go

@@ -0,0 +1,26 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_19 //nolint
+
+import (
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+// AlterPublicGPGKeyImportContentFieldToMediumText: set GPGKeyImport Content field to MEDIUMTEXT
+func AlterPublicGPGKeyImportContentFieldToMediumText(x *xorm.Engine) error {
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	if setting.Database.UseMySQL {
+		if _, err := sess.Exec("ALTER TABLE `gpg_key_import` CHANGE `content` `content` MEDIUMTEXT"); err != nil {
+			return err
+		}
+	}
+	return sess.Commit()
+}