Add github compatible tarball download API endpoints (#32572)

Fix #29654 
Fix #32481

routers/api/v1/api.go

@@ -1377,6 +1377,8 @@ func Routes() *web.Router {
 					m.Post("", bind(api.UpdateRepoAvatarOption{}), repo.UpdateAvatar)
 					m.Delete("", repo.DeleteAvatar)
 				}, reqAdmin(), reqToken())
+
+				m.Get("/{ball_type:tarball|zipball|bundle}/*", reqRepoReader(unit.TypeCode), repo.DownloadArchive)
 			}, repoAssignment(), checkTokenPublicOnly())
 		}, tokenRequiresScopes(auth_model.AccessTokenScopeCategoryRepository))