support following symlinks

In my case, the app.py is a symlink to a file in the parent directory (long story, but there is a good reason for this). When rsconnect deploys an app, does it follow local symlinks so that the content is deployed to the server?
The reason I have symlinks is because I have many apps in the same directory (named app_basic.py, app_recipes.py, etc.) and I want to deploy the apps individually, but I think rsconnect wants them to be named app.py. So I made a directory for each with symlinks from foo/app.py to the original file, like app_basic.py.
Why are they all in the same directory? Because they share common submodules, like utils.py, chat/init.py, and so on.

When constructing the list of files to bundle we currently rely on os.path.isfile so symlinks are not followed.

rsconnect/bundle.py の 962 行目付近にある os.path.isfile の呼び出しから始めます。ここでバンドルするファイルのリストが構築されています。そのリストがデプロイ時にどのように使用されるかを追跡し、シンボリックリンクされたアプリファイルのリンク先の内容が、既存のファイル選択動作を壊すことなくバンドルに含まれることを確認します。