fix: UTF-8 support for docker images.

[alxbl]

Closes #247.

[obilodeau]

Changes in the Dockerfile seems to be only made to the compile image. Did you test this? If it fixed the problem it feels like the logger changes were enough.

That said, it might fail at the filesystem file open moment...

I think we should add the locale/utf-8 changes to the runtime image too.

[alxbl]

Hmm, I just tested again, now I get utf-8... for both images (slim and not slim) I'm not sure why that is. I'll try to play around with the dockerfiles and see if we can just get rid of the extra steps.

[obilodeau]

Have in mind that I bumped the docker images to ubuntu 20.04 recently in #251. Maybe there's a ubuntu fix or a python version change that fixed the behavior there.

[alxbl]

Ah, that could be it. The LANG and LC_TYPE are still not set though.

In any case, I tried removing the Dockerfile changes and the issue still seems resolved. We'll keep the logging part in, but I believe that updating to 20.04 means Python 3.8, which uses utf8 by default.

[obilodeau]

LGTM, merging