[Issue 16349] better curl retry for install.sh script

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16349

--- Comment #2 from Martin Nowak <code at dawg.eu> ---
(In reply to greenify from comment #1)
> It's definitely good if the installation gets more robust, but maybe we can also
> dig into the root cause of the random network failures. I never experienced
> such  constant problems with other providers, do you know anything what
> could cause this? Should we consider to provide a more stable distribution
> way like e.g. Github Releases?

Network failures are normal, everyone has to properly deal w/ them.
Our binaries are already hosted on S3 (that's where Github Releases come from
as well).

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