WIP rewrite section on configuring proxies for containers

[thaJeztah]

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Signed-off-by: Sebastiaan van Stijn [email protected]

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[thaJeztah]

Just pushing this as a draft; this is very unfinished (need to rewrite the last section and also mention upper/lowercase etc)

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[thaJeztah]

I need to collect more changes and put them together, e.g. https://github.com/docker/docker.github.io/pull/8352 and https://github.com/docker/docker.github.io/pull/12463 (which also isn't correct, as "it depends")

And describe that handling of NO_PROXY is quite different (depending on what software uses it), same as for upper/lowercase cURL, wget, and Golang don't agree on those.

[usha-mandya]

@thaJeztah Is this PR still relevant? Thanks.

[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[thaJeztah]

Reopening for now (still in draft), but still something to finish.

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[dvdksn]

@thaJeztah I continued on some of the changes you started in this PR. PTAL and let me know if there's more stuff that we should add/change in the scope of this

[thaJeztah]

Oh! Thanks, sorry forgot about this one; gonna give this one a look Today.

I see there's one link failure; perhaps we need a custom id / anchor somewhere;

========================================================================
engine/reference/commandline/cli/index.html
  hash does not exist --- engine/reference/commandline/cli/index.html --> /config/daemon/systemd/#httphttps-proxy
engine/reference/commandline/dockerd/index.html
  hash does not exist --- engine/reference/commandline/dockerd/index.html --> /config/daemon/systemd/#httphttps-proxy
========================================================================

[dvdksn]

Fixed the broken link upstream in docker/cli#4249 - will need to backport that one