[Issue 21226] Bug in installer.sh#L552-L556 and missing signature files

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21226

Seb <greeenify at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |greeenify at gmail.com

--- Comment #3 from Seb <greeenify at gmail.com> ---
PR only fixed the installer script, the issue is kept open as the old archives
still need to signed.

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