brew.sh: always run test-bot under Ruby 3 #16253
Merged
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We set
HOMEBREW_DEVELOPER
withintest-bot
so we end up running a mixed 2.6 and 3.1 mode that installs and uninstalls Ruby 3 repeatedly depending on the command.Easiest fix is to force test-bot to be Ruby 3. Stuff like
brew -v test-bot
isn't detected here but this code is going to disappear on Monday anyway.Fixes Homebrew/homebrew-test-bot#988