Packaging a seperate directory for deployment

I’m trying to include a directory into my package/deployment but it doesn’t get included in the zip file - deployed files.

The folder is resources/RSA and contains a server cert used to create a jwt token.

I’ve tried adding
- resources/RSA/**

into my serverless.yml but it has no effect.
Other than that, it works like a charm!

Help me obi-wan, you’re my only hope!