Description

The idea is to introduce the possibility to cache downloads from GH runners to lower downstream bandwidth used and increase overall speed. Especially on machines with lots of runner this could save quite some bandwidth while sacrificing disk space. http caching has been tested and seem to work nicely.

https caching is a lot more tricky and may be introduced later.

This PR has two parts:

• set apt repository to http instead of https where possible. Packages are signed anyways.
• Pass various proxy environment variables to docker so it respects those. Doesn't make sense not to pass them since when using PREFER_DOCKER=no and any of these variables are set beforehand they just work. So this more or less just harmonizes overall behavior.

There is still an issue on line 4838 caused by https://github.com/armbian/build/blob/c0da65087aad628ba0714f23d8d29800f152d97c/lib/functions/rootfs/apt-install.sh#L67 due to absence of apt proxy setting there. Not sure why this is not added here?

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• [x] build random image: https://paste.armbian.de/xopitiguyo , look for 10.100.0.87 to see where it is used
• [x] built the same random image but having all proxy env variables unset beforehand: builds just fine as well: https://paste.armbian.de/ozidivugor

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules

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