[CHORE] Remove Microsoft SQL Server Support

- Per https://codeberg.org/forgejo/discussions/issues/122

cmd/doctor_convert.go

@@ -17,7 +17,7 @@ import (
 var cmdDoctorConvert = &cli.Command{
 	Name:        "convert",
 	Usage:       "Convert the database",
-	Description: "A command to convert an existing MySQL database from utf8 to utf8mb4 or MSSQL database from varchar to nvarchar",
+	Description: "A command to convert an existing MySQL database from utf8 to utf8mb4",
 	Action:      runDoctorConvert,
 }
 
@@ -35,21 +35,14 @@ func runDoctorConvert(ctx *cli.Context) error {
 	log.Info("Log path: %s", setting.Log.RootPath)
 	log.Info("Configuration file: %s", setting.CustomConf)
 
-	switch {
-	case setting.Database.Type.IsMySQL():
+	if setting.Database.Type.IsMySQL() {
 		if err := db.ConvertDatabaseTable(); err != nil {
 			log.Fatal("Failed to convert database & table: %v", err)
 			return err
 		}
 		fmt.Println("Converted successfully, please confirm your database's character set is now utf8mb4")
-	case setting.Database.Type.IsMSSQL():
-		if err := db.ConvertVarcharToNVarchar(); err != nil {
-			log.Fatal("Failed to convert database from varchar to nvarchar: %v", err)
-			return err
-		}
-		fmt.Println("Converted successfully, please confirm your database's all columns character is NVARCHAR now")
-	default:
-		fmt.Println("This command can only be used with a MySQL or MSSQL database")
+	} else {
+		fmt.Println("This command can only be used with a MySQL database")
 	}
 
 	return nil

cmd/dump.go

@@ -128,7 +128,7 @@ It can be used for backup and capture Forgejo server image to send to maintainer
 		&cli.StringFlag{
 			Name:    "database",
 			Aliases: []string{"d"},
-			Usage:   "Specify the database SQL syntax: sqlite3, mysql, mssql, postgres",
+			Usage:   "Specify the database SQL syntax: sqlite3, mysql, postgres",
 		},
 		&cli.BoolFlag{
 			Name:    "skip-repository",