git: one generator per app, multiple instances

this allows locking for access for each org

workflow-pr/pr_processor.go

@@ -44,7 +44,7 @@ func (w *RequestProcessor) ProcessFunc(request *common.Request) error {
 		return fmt.Errorf("Cannot find config for branch '%s'", req.Pull_Request.Base.Ref)
 	}
 
-	git, err := w.git.CreateGitHandler(GitAuthor, GitEmail, AppName)
+	git, err := w.git.CreateGitHandler(config.Organization, config.Branch)
 	if err != nil {
 		return fmt.Errorf("Error allocating GitHandler. Err: %w", err)
 	}