Run shellcheck on shell/install.sh and make it pass #6313
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This is a partial subset of #5778.
This PR is meant as a way to more easily kickstart the use of shellcheck to lint checkout shell scripts.
Details of reason behind the shell changes:
$()
vs backtickslocal
$@
in stringsread
without-r
will interpret backslashesprintf
could contain%
which could make the command failThis PR also make sure the script keeps passing
shellcheck
by adding it to our CI.