Travis ppc64le network issue work-around

[ax3l]

Description

Hi,

I currently see network issues with docker containers on Travis CI ppc64le builders.
Essentially, connections seem to time out, e.g., on yum update.

The same problem seems to be known in conda-forge and adding --network=host to docker run seems to solve the issue.

Do you know how I can most simply apply the same work-around in cibuildwheel?

X-ref:

• Add workaround for Travis CI network issues conda-forge/conda-smithy#1520

Build log

X-ref:

• Wheels: 0.14.3 openPMD/openPMD-api#1136

CI config

• https://github.com/openPMD/openPMD-api/tree/wheels

[ax3l]

I think the logic is implemented in cibuildwheel in https://github.com/pypa/cibuildwheel/blob/main/cibuildwheel/docker_container.py

We probably need to add this to docker create there.

Draft PR posted to #906