Dump github/gitlab/gitea repository data to a local directory and restore to gitea (#12244)

* Dump github/gitlab repository data to a local directory

* Fix lint

* Adjust directory structure

* Allow migration special units

* Allow migration ignore release assets

* Fix lint

* Add restore repository

* stage the changes

* Merge

* Fix lint

* Update the interface

* Add some restore methods

* Finish restore

* Add comments

* Fix restore

* Add a token flag

* Fix bug

* Fix test

* Fix test

* Fix bug

* Fix bug

* Fix lint

* Fix restore

* refactor downloader

* fmt

* Fix bug isEnd detection on getIssues

* Refactor maxPerPage

* Remove unused codes

* Remove unused codes

* Fix bug

* Fix restore

* Fix dump

* Uploader should not depend downloader

* use release attachment name but not id

* Fix restore bug

* Fix lint

* Fix restore bug

* Add a method of DownloadFunc for base.Release to make uploader not depend on downloader

* fix Release yml marshal

* Fix trace information

* Fix bug when dump & restore

* Save relative path on yml file

* Fix bug

* Use relative path

* Update docs

* Use git service string but not int

* Recognize clone addr to service type

modules/migrations/base/downloader.go

@@ -7,20 +7,13 @@ package base
 
 import (
 	"context"
-	"io"
 	"time"
 
 	"code.gitea.io/gitea/modules/structs"
 )
 
-// AssetDownloader downloads an asset (attachment) for a release
-type AssetDownloader interface {
-	GetAsset(relTag string, relID, id int64) (io.ReadCloser, error)
-}
-
 // Downloader downloads the site repo informations
 type Downloader interface {
-	AssetDownloader
 	SetContext(context.Context)
 	GetRepoInfo() (*Repository, error)
 	GetTopics() ([]string, error)