Desired git reference. Could be a commit, tag,
or branch name. Defaults to "master".
subdir
A subdirectory in the repository that
contains the app. By default, this function will run an
app from the top level of the repo, but you can use a
path such as `"inst/shinyapp".
port
The TCP port that the application should
listen on. Defaults to port 8100.
launch.browser
If true, the system's default web
browser will be launched automatically after the app is
started. Defaults to true in interactive sessions only.