init_fs_encoding on google/cloud-sdk:slim docker image

I have managed to get my fairly complicated python application to build even though it contains pandas and numpy. However I noticed that whenever I try and run it on google/cloud-sdk:slim docker image it fails. I traced it down to even hello world application failing without any error other than below
```
error instantiating embedded Python interpreter: during initializing Python main: init_fs_encoding: failed to get the Python codec of the filesystem encoding
```
[Dockerfile.txt](https://github.com/indygreg/PyOxidizer/files/9303044/Dockerfile.txt)
Here is a docker file that builds a helloworld application using python 3.8 on the manylinux build docker and then runs it inside google/cloud-sdk:slim as a minimal repeatable error. I have not tried other python versions yet or other build instances nor using musl as I cannot make standalones with numpy

Start with the linked Dockerfile.txt and reproduce the Python 3.8 hello-world build using the manylinux environment, then run it in google/cloud-sdk:slim. Confirm the init_fs_encoding failure and compare the standalone application's runtime assumptions with the container. Done means the failure is explained and the reported standalone application runs successfully in the target image.

Written by the indexing model from the issue text.