Add AWS_REGION to environment defaults

[clschnei]

Description

The attempts to fix the necessity to explicitly set your region. Documentation from AWS prevents us from setting AWS_REGION in the environment config because it is reserved.

Possible Related Issues

• Failure: Missing region in config #189
• Cant seem to set region properly #442

[dherault]

Thanks @clschnei ! v3.25.15

[clschnei]

Is there a process for getting these published to npm? For now I'm just using my forked github ref as a package, but would like to migrate off soon as this goes "live".

[dherault]

it is published. v3.25.15. Sorry i forgot to publish :)

[rstar2]

The AWS_REGION is added to environment for the handler but if there's an authorizer-handler in front it is still 'undefined' and thus working with the 'aws-sdk' in the authorizer is not possible again.
Adding:
Object.assign( process.env, { AWS_REGION: serverless.service.provider.region });
in createAuthScheme.js just before creating the authorizer handler
handler = functionHelper.createHandler(funOptions, options); fixes it.
Sorry I'm a little new to Git and don't know how to propose pull request