Migrate to prjgit based config

config now only has reference to org or prjgits and the rest
is defined in the "workflow.config" in the prjgit itself. This
allows the config to be updated in the project.

bots-common/gitea_utils.go

@@ -479,8 +479,11 @@ func (gitea *GiteaTransport) AddReviewComment(pr *models.PullRequest, state mode
 }
 
 func (gitea *GiteaTransport) GetRepositoryFileContent(org, repo, hash, path string) ([]byte, string, error) {
-	content, err := gitea.client.Repository.RepoGetContents(
-		repository.NewRepoGetContentsParams().WithOwner(org).WithRepo(repo).WithFilepath(path).WithRef(&hash),
+	params := repository.NewRepoGetContentsParams().WithOwner(org).WithRepo(repo).WithFilepath(path)
+	if len(hash) > 0 {
+		params = params.WithRef(&hash)
+	}
+	content, err := gitea.client.Repository.RepoGetContents(params,
 		gitea.transport.DefaultAuthentication,
 	)