How to build behind a proxy

[dan-bar-dov]

Describe the bug
The cmake process is trying to download other packages. They all fail when I'm behind a proxy. It is not clear what tool is used to download, but it fails. The environment is set with a correct http/https proxies. wget works, so does curl.

To Reproduce
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4. See error

Expected behavior
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Asciinema

see https://asciinema.org/ for recording video in terminal

** Environment Info **

• operating system
• git hash
• compiler

Additional context
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[emaxerrno]

@dan-bar-dov we just use cmake which internally uses git see 3rdparty.cmake.in template.

If you follow the CMakeLists.txt you'll see a cmake-in-cmake - this is key for reproducibility of binaries, wehre the same link flags and compile flags are passed through all dependencies.

Would be great to have a docker container, too. Let me know if you'd like to contribute to this.

Currently, i'm packed w/ http://github.com/vectorizedio/redpanda but can mentor your changes.