Add extra user information when migrating release (#8331)

* add extra user information when migrating release

* add migrations

* fix tests

modules/migrations/github_test.go

@@ -167,6 +167,8 @@ func TestGitHubDownloadRepo(t *testing.T) {
 			Body:            "Forked source from Gogs into Gitea\n",
 			Created:         time.Date(2016, 10, 17, 02, 17, 59, 0, time.UTC),
 			Published:       time.Date(2016, 11, 17, 15, 37, 0, 0, time.UTC),
+			PublisherID:     4726179,
+			PublisherName:   "bkcsoft",
 		},
 	}, releases[len(releases)-1:])