Read the package.json name in the serverless.yml

To achieve a dynamic service name based on the package.json app name I took advantage of the variable import Serverless Framework feature.

https://www.serverless.com/framework/docs/providers/aws/guide/variables/#reference-variables-in-javascript-files

This loads the file package.json and specifies that the name property should be applied to the service entry.

# serverless.yml
service: ${file(./package.json):name}