Exclude tests from compiler

[GJKrupa]

Related to RocketChat/Rocket.Chat.Apps-cli#43

I've added some Jest tests to my app which should be excluded from the package (all the tests are named *.spec.ts) but when I try to package the app with rc-apps v1.8.1 it I'm getting the following error because the app compiler appears to be trying to compile the tests without including the Jest dependency from package.json:

$ rc-apps package
packaging your app... !
 ›   Error: Error src/StandardTickets.spec.ts (9,1): Cannot find name 'beforeEach'.

[preeesha]

Hey, @d-gubert, I would love to work on this feature as I myself feel its need. Can you please provide me a green signal so that I can start working?

Thanks for your time and consideration
Prisha Gupta