Split migrations folder (#21549)

There are too many files in `models/migrations` folder so that I split
them into sub folders.

models/migrations/v1_17/v221.go

@@ -0,0 +1,75 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package v1_17 // nolint
+
+import (
+	"encoding/base32"
+	"fmt"
+
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+func StoreWebauthnCredentialIDAsBytes(x *xorm.Engine) error {
+	// Create webauthnCredential table
+	type webauthnCredential struct {
+		ID           int64 `xorm:"pk autoincr"`
+		Name         string
+		LowerName    string `xorm:"unique(s)"`
+		UserID       int64  `xorm:"INDEX unique(s)"`
+		CredentialID string `xorm:"INDEX VARCHAR(410)"`
+		// Note the lack of INDEX here - these will be created once the column is renamed in v223.go
+		CredentialIDBytes []byte `xorm:"VARBINARY(1024)"` // CredentialID is at most 1023 bytes as per spec released 20 July 2022
+		PublicKey         []byte
+		AttestationType   string
+		AAGUID            []byte
+		SignCount         uint32 `xorm:"BIGINT"`
+		CloneWarning      bool
+		CreatedUnix       timeutil.TimeStamp `xorm:"INDEX created"`
+		UpdatedUnix       timeutil.TimeStamp `xorm:"INDEX updated"`
+	}
+	if err := x.Sync2(&webauthnCredential{}); err != nil {
+		return err
+	}
+
+	var start int
+	creds := make([]*webauthnCredential, 0, 50)
+	for {
+		err := x.Select("id, credential_id").OrderBy("id").Limit(50, start).Find(&creds)
+		if err != nil {
+			return err
+		}
+
+		err = func() error {
+			sess := x.NewSession()
+			defer sess.Close()
+			if err := sess.Begin(); err != nil {
+				return fmt.Errorf("unable to allow start session. Error: %w", err)
+			}
+			for _, cred := range creds {
+				cred.CredentialIDBytes, err = base32.HexEncoding.DecodeString(cred.CredentialID)
+				if err != nil {
+					return fmt.Errorf("unable to parse credential id %s for credential[%d]: %w", cred.CredentialID, cred.ID, err)
+				}
+				count, err := sess.ID(cred.ID).Cols("credential_id_bytes").Update(cred)
+				if count != 1 || err != nil {
+					return fmt.Errorf("unable to update credential id bytes for credential[%d]: %d,%w", cred.ID, count, err)
+				}
+			}
+			return sess.Commit()
+		}()
+		if err != nil {
+			return err
+		}
+
+		if len(creds) < 50 {
+			break
+		}
+		start += 50
+		creds = creds[:0]
+	}
+	return nil
+}