(aws_lambda_python): PythonFunction runtime is not respected

[l0b0]

When trying to change from deploying an aws_lambda.Function to an aws_lambda_python.PythonFunction, even though I've set runtime=aws_lambda.Runtime.PYTHON_3_8 the Docker builds are performed with ARG IMAGE=amazon/aws-sam-cli-build-image-python3.7

Reproduction Steps

1. Instantiate a PythonFunction with runtime=aws_lambda.Runtime.PYTHON_3_8.
2. cdk synth

What did you expect to happen?

CDK should use the Python 3.8 image to build.

What actually happened?

CDK used the default Python 3.7 image to build.

Environment

• CDK CLI Version : 1.98.0 (build 79f4512)
• Framework Version: aws-cli/1.19.52 Python/3.8.6 Linux/5.11.13-arch1-1 botocore/1.20.52
• Node.js Version: v14.15.1
• OS : Arch Linux
• Language (Version): Python (3.8.6)

Other

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This is 🐛 Bug Report

[eladb]

@adamelmore can you please take a look?

[eladb]

@peterwoodworth can you try to reproduce this? Code seems to suggest that the runtime version is respected. Reassign to me when ready.

[peterwoodworth]

I can't seem to reproduce this @eladb

@l0b0 are you still running into this issue?

[eladb]

I am closing this for now. @l0b0 let us know if this is still relevant.

[github-actions]

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