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/comment.go

@@ -9,10 +9,10 @@ import "time"
 
 // Comment is a standard comment information
 type Comment struct {
-	IssueIndex  int64
-	PosterID    int64
-	PosterName  string
-	PosterEmail string
+	IssueIndex  int64  `yaml:"issue_index"`
+	PosterID    int64  `yaml:"poster_id"`
+	PosterName  string `yaml:"poster_name"`
+	PosterEmail string `yaml:"poster_email"`
 	Created     time.Time
 	Updated     time.Time
 	Content     string