Small team of developers doing their work here and there. We have a team leader, and is sole responsible for uploading updated source files from the development server to the production server. So let's say, so if an updated files needs to be uploaded to the prod server, that concerned developer shall notify the team lead about it, and then the team lead will update the files to the prod server. So no developer has an access to the prod server except for the team lead. That's our current setup.

Now, what we want to do is to give developers a way for uploading their updated files to the server without the team lead intervening in the process. What do you think is the best way to go about this?