Add push to remote mirror repository (#15157)

* Added push mirror model.

* Integrated push mirror into queue.

* Moved methods into own file.

* Added basic implementation.

* Mirror wiki too.

* Removed duplicated method.

* Get url for different remotes.

* Added migration.

* Unified remote url access.

* Add/Remove push mirror remotes.

* Prevent hangs with missing credentials.

* Moved code between files.

* Changed sanitizer interface.

* Added push mirror backend methods.

* Only update the mirror remote.

* Limit refs on push.

* Added UI part.

* Added missing table.

* Delete mirror if repository gets removed.

* Changed signature. Handle object errors.

* Added upload method.

* Added "upload" unit tests.

* Added transfer adapter unit tests.

* Send correct headers.

* Added pushing of LFS objects.

* Added more logging.

* Simpler body handling.

* Process files in batches to reduce HTTP calls.

* Added created timestamp.

* Fixed invalid column name.

* Changed name to prevent xorm auto setting.

* Remove table header im empty.

* Strip exit code from error message.

* Added docs page about mirroring.

* Fixed date.

* Fixed merge errors.

* Moved test to integrations.

* Added push mirror test.

* Added test.

models/repo_mirror.go

@@ -14,6 +14,12 @@ import (
 	"xorm.io/xorm"
 )
 
+// RemoteMirrorer defines base methods for pull/push mirrors.
+type RemoteMirrorer interface {
+	GetRepository() *Repository
+	GetRemoteName() string
+}
+
 // Mirror represents mirror information of a repository.
 type Mirror struct {
 	ID          int64       `xorm:"pk autoincr"`
@@ -52,6 +58,16 @@ func (m *Mirror) AfterLoad(session *xorm.Session) {
 	}
 }
 
+// GetRepository returns the repository.
+func (m *Mirror) GetRepository() *Repository {
+	return m.Repo
+}
+
+// GetRemoteName returns the name of the remote.
+func (m *Mirror) GetRemoteName() string {
+	return "origin"
+}
+
 // ScheduleNextUpdate calculates and sets next update time.
 func (m *Mirror) ScheduleNextUpdate() {
 	if m.Interval != 0 {