add a lambda layer release artifact for boto3

[kapilt]

Historically lambda team updated the python/boto3 sdk in lambda, since q3/q4 last year they seemed to have moved away from it. Unfortunately for projects using python with newer aws services or features that causes a bit of a disconnect as they may work locally they won't in lambda without packaging up the sdk. Having lots of users do that across lots of functions seems a bit wasteful. As an alternative, it would be nice if boto3 releases were automatically released as a lambda layer in addition to the pypi release.

[stealthycoin]

That sounds like an interesting idea to me. I'll mark this as a feature request.

[egallmann]

Would building a layer and maintaining it be the easiest way to manage keeping the boto3 version current for multiple development teams? I'm happy to do this in the interim, but would love the boto3 version stay current for the lambda runtime.