Server errors when working with wheels

[Solmath]

When using

RUN pip install --no-cache /wheels/*

with the wheels built in the first build step, there is an internal server error caused by waitress, when trying to access /departures.

This indicates that /departures is not served, because maybe the EFA package is not properly included.

When using

RUN pip install --no-cache -r requirements.txt

instead, everything is working fine.

Need to find out which wheels are actually built and copied to the second build step.

[Solmath]

It looks like the [async] extra is not considered, when building the wheel. I works if flask[async] is installed manually after installing the wheels.