fix(repo): prevent MarkAsBrokenEmpty when repository is being migrated (#39091)

services/context/repo.go

@@ -695,6 +695,12 @@ func repoAssignmentPrepareGitRepo(ctx *Context, data *repoAssignmentPrepareDataS
 	ctx.Repo.GitRepo, err = git.RepositoryFromRequestContextOrOpen(ctx, repo)
 	if err != nil {
 		if strings.Contains(err.Error(), "repository does not exist") || strings.Contains(err.Error(), "no such file or directory") {
+			// A repository that is still being created (migrated or forked) does not have its
+			// git data on disk yet, so opening it fails. This is expected and must not be
+			// treated as a permanently broken repository.
+			if ctx.Repo.Repository.IsBeingCreated() {
+				return
+			}
 			log.Error("Repository %-v has a broken repository on the file system: %s Error: %v", ctx.Repo.Repository, ctx.Repo.Repository.FullName(), err)
 			ctx.Repo.Repository.MarkAsBrokenEmpty()
 			// Only allow access to base of repo or settings