Adding modules to a cypress container

[Obelix74Git]

Hi,
We use the container cypress/included to run our tests. In our test scripts, the cypress developers use the module cypress-mochawesome-reporter. However, this module is not installed in the container cypress/included and I therefore have to add it myself.
How do you add a module to a container, and to make it even more challenging, in an environment that has no internet connectivity?
Thanks for your help.