# install to final destination in /usr and not into /opt/ruby-xxx
eval "$(
 declare -f package | \
    sed '
      s|local _gemdir.*|local _gemdir="/usr/lib/ruby/gems/3.0.0"|g
    '
)"

# Command failed with status (1): [/opt/ruby-bootstrap-3.0.4/bin/ruby run-tes...]
# /build/ruby-csv/src/csv-3.2.5/Rakefile:10:in `block in <top (required)>'
# Tasks: TOP => test
unset check