Zip example breaks compatibility for python dependencies with layers

[sansmoraxz]

The examples for python are overwriting the environment variable for PYTHONPATH. The layers are stored mounted to /opt directory. Python dependencies from layers are mounted to /opt/python. This will result in code failing to import dependencies properly.

I propose updating the run.sh scripts to something like:

#!/bin/bash

PATH=$PATH:$LAMBDA_TASK_ROOT/bin \
    PYTHONPATH=$LAMBDA_TASK_ROOT:$PYTHONPATH:/opt/python \
    exec python -m uvicorn --port=$PORT main:app

Working example repo here: sansmoraxz/fastapi-layer-zip-example-with-layers

[bnusunny]

Thanks for reporting this issue. Would you like to push a PR?

[sansmoraxz]

Sure.