driver/docker: allow configurable pull context timeout setting. #8589
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Pulling large docker containers can take longer than the default
context timeout. Without a way to change this it is very hard for
users to utilise Nomad properly without hacky work arounds.
This change adds an optional pull_timeout config parameter which
gives operators the possibility to account for increase pull times
where needed. The infra docker image also has the option to set a
custom timeout to keep consistency.
Once/if we agree on the approach and names I will raise a separate
PR to track the docs updates.
closes #5718