Meet ruby-local-exec

ruby-local-exec is a drop-in replacement for the standard Ruby
shebang line:

#!/usr/bin/env ruby-local-exec

Use it for scripts inside a project with an .rbenv-version
file. When you run the scripts, they'll use the project-specified
Ruby version, regardless of what directory they're run from. Useful
for e.g. running project tasks in cron scripts without needing to
cd into the project first.