Added notice about timeout function for macOs.

[AlexeyKuznetsov-DD]

Motivation

While following the README.md setup instructions on my personal MacBook, the first command (./build.sh -i runner) failed.

After a short investigation, I discovered that macOS does not provide the timeout command by default. On macOS, the equivalent functionality is available via GNU coreutils as gtimeout.

Changes

• Updated README.md with instructions for installing coreutils on macOS.

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[github-actions]

CODEOWNERS have been resolved as:

README.md                                                               @DataDog/system-tests-core

[nccatoni]

Looking to my own system, macOS seems to have the timeout command from coreutils (/opt/homebrew/opt/coreutils/libexec/gnubin/timeout)

[AlexeyKuznetsov-DD]

Looking to my own system, macOS seems to have the timeout command from coreutils (/opt/homebrew/opt/coreutils/libexec/gnubin/timeout)

yep, probably you installed it at some point.
As a recent new joiner I have clean MacOS laptop, so no coreutils installed for me.

[nccatoni]

I understand that, but why did you use gtimeout instead of timeout?

[AlexeyKuznetsov-DD]

I understand that, but why did you use gtimeout instead of timeout?

If I understand correctly coreutils would provide gtimeout OOTB (Homebrew prefixes GNU tools with g to avoid clashing with BSD tools.), and to get timeout you may need to do additional steps, like adding /opt/homebrew/opt/coreutils/libexec/gnubin/timeout to the PATH variable or adding alias manually.

So, I think using gtimeout is a bit simpler than asking user to do additional manipulations more than just brew install coreutils. Does it make sense?