feat(lambda): configure workdir for docker image based functions

[blaenk]

CloudFormation allows setting the WorkingDirectory property in AWS::Lambda::Function.ImageConfig to override the docker container's working directory, but this isn't currently exposed through CDK. Not sure if that was intentional.

This PR wires that up.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[gitpod-io]

[mergify]

Title does not follow the guidelines of Conventional Commits. Please adjust title before merge.

[blaenk]

PR Linter / validate-pr (pull_request):

Error: Features must contain a change to a README file

Which? It seems the readme already doesn't cover the other properties like entryPoint (they're instead documented in the auto-generated docs).

Would this qualify as a fix instead then since it's adding a property that wasn't previously exposed?

[nija-at]

Thanks for submitting this PR. Looks great!

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Pull request has been modified.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: dafed60
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).