firebase-ruby gem packaged for AWS Lambda Layer
Using gems in Lambda isn't all that hard, especially Ruby native ones. This is a Makefile for firebase-ruby which will prepare the gems to be used with Lambda layers.
makeThis will prepare firebase-ruby (incl. jwt, the only dependency) into a single zip file: lambda-layers.zip which can be used with your Ruby 2.7.0 functions. Just upload this zip file to your AWS Lambda layer, that's all.