Installing home made package with rstan

Dear R wizards,
I and my team have recently released a package that uses rstan (it's called PandemicLP, BTW, and implements our model for long term predictions of pandemic data).

One user contacted us saying that they were having problems installing it in RStudio Cloud and I went to test it and verified that the installation failed due to the compilation process extrapolating the 1GB memory limit on the platform.

So, reading a bit more, I found out that the platform "stores the package in cache" in other cases, such as rstan itself. Therefore, my question is about what that means and how I can make that happen for our package, so that it is available on the platform for users installing it.

Thank you for your time,