Pass Ruby interpreter path when replacing process by launcher #2979
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Motivation
Fixes the error reported in #2936 (comment).
On Windows, it's not possible to invoke
exec
with an executable script because the OS doesn't understand the shebang line that defines the Ruby interpreter. We need to manually invoke the Ruby interpreter to run the file.Implementation
Started adding
Gem.ruby
to invoke the Ruby interpreter directly. This works on Linux and MacOS too.