Avatars and Repo avatars support storing in minio (#12516)

* Avatar support minio

* Support repo avatar minio storage

* Add missing migration

* Fix bug

* Fix test

* Add test for minio store type on avatars and repo avatars; Add documents

* Fix bug

* Fix bug

* Add back missed avatar link method

* refactor codes

* Simplify the codes

* Code improvements

* Fix lint

* Fix test mysql

* Fix test mysql

* Fix test mysql

* Fix settings

* Fix test

* fix test

* Fix bug

modules/setting/database.go

@@ -47,7 +47,8 @@ var (
 		ConnMaxLifetime   time.Duration
 		IterateBufferSize int
 	}{
-		Timeout: 500,
+		Timeout:           500,
+		IterateBufferSize: 50,
 	}
 )