Build binary package

Build a binary package, given a remote-style reference to a package (e.g., user/repo)

pb_build(ref, extra_dependencies = NULL, workdir = NULL)

Arguments

ref	A remote-style refrence to a package (e.g., user/repo)
extra_dependencies	An optional character vector of additional dependencies to install, also remote-style references.
workdir	An optional working directory to use. If non-NULL, then source trees will persist across calls to pb_build, which will make things a little faster.