Allow people to run this command (so we can ask people to test it)
without having to set `HOMEBREW_DEVELOPER`.
ClosesHomebrew/homebrew#48260.
Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
* use HOMEBREW_REPOSITORY instead of HOMEBREW_PREFIX
* better performance:
* update-bash: avoid shellout
* update-report: use strip_prefix and tr
* more robust:
* explicitly handle the case when repo is HOMEBREW_REPOSITORY to avoid
to handle the trailing backslash.
* handle both lower case and upper case when stripping non alpha and
digital characters.
