Use overmind if available

[MatheusRich]

Use overmind instead of foreman, if available

Overmind is a process manager (like foreman) for Procfile-based
applications. The advantage is that it allows to use debuggers like
pry or binding.irb.

(Maybe this should be a PR against Rails?)

[stevepolitodesign]

Use overmind instead of foreman, if available

Meaning, we'd check to see if Overmind is available on the user's system?

Currently, Rails generates ./bin/dev for applications using jsbundling-rails.

We could probably modify that file to check for the existence of Overmind.

[MatheusRich]

@stevepolitodesign yes! I forgot to attach the code for it:

#!/usr/bin/env sh

# Magic happens here
if command -v overmind &> /dev/null
then
  overmind start -f Procfile.dev "$@"
  exit $?
fi

if ! gem list foreman -i --silent; then
  echo "Installing foreman..."
  gem install foreman
fi

exec foreman start -f Procfile.dev "$@"