HTTP(S) and Network mode options in Compute worker

[ObadaS]

A brief description of the purpose of the changes contained in this PR.

Added 3 new env variables to control the HTTP(S) proxy and whether to enable network access to the competition container

COMPETITION_CONTAINER_NETWORK_DISABLED=False


COMPETITION_CONTAINER_HTTP_PROXY=https://example_proxy:123
COMPETITION_CONTAINER_HTTPS_PROXY=http://example_proxy:1233

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge

[Didayolo]

Please add documentation about this

[Didayolo]

Do you have a good suggestion on how to test this? Simply a scoring program that tries to download something?

[ObadaS]

Do you have a good suggestion on how to test this? Simply a scoring program that tries to download something?

Yes, this is a good way to test the first new option (disable network)

For the Proxy options, you will need to use a VM that is behind a proxy, like our local GPU servers

[Didayolo]

Optional addition: made the ColumnFactory more robust.

At first try the CircleCI test did not pass, but I think it just happened randomly (the same key appeared twice) and is not related to this PR.

[Didayolo]

All good to me. We need to test the Proxy part of the PR on the staging server