Stick the gel command in the enviornment

[tenderlove]

I am trying to install Rails using Gel only. But the Rails installation
scripts have a hard dependency on Bundler
here.

To fix this, I want to add necessary features so that Gel can replace
this code. The first issue I want to tackle is this
line
that tries to get the Bundler executable. I don't use Gel from
RubyGems, so it doesn't really make sense to ask Gem what the path is
for the Gel executable. To get around this issue, I would like to stick
the Gel program name in the environment as GEL_PROGRAM_NAME. Then
when I do:

$ gel exec rails new ~/git/blah

Rails will know that it's being executed with Gel, and it will also know
where to find the Gel binfile so that the install process can gel install on the newly created Rails app.

[tenderlove]

The actual command I'm trying to execute is gel exec ruby railties/exe/rails new ~/git/testing --dev while I'm inside a checkout of Rails.

The error I see is this:

[aaron@tc-lan-adapter💪 ~/g/rails (main)]$ gel exec ruby railties/exe/rails new ~/git/testing --dev
/Users/aaron/.local/gel/3.2.0+0/gems/digest-3.1.0/lib/digest/version.rb:4: warning: already initialized constant Digest::VERSION
/Users/aaron/.rubies/arm64/ruby-trunk/lib/ruby/3.2.0+0/digest/version.rb:4: warning: previous definition of VERSION was here
/Users/aaron/.local/gel/3.2.0+0/gems/digest-3.1.0/lib/digest.rb:20: warning: already initialized constant Digest::REQUIRE_MUTEX
/Users/aaron/.rubies/arm64/ruby-trunk/lib/ruby/3.2.0+0/digest.rb:20: warning: previous definition of REQUIRE_MUTEX was here
/Users/aaron/.local/gel/3.2.0+0/ext/strscan-3.0.1/strscan.bundle: warning: already initialized constant StringScanner::Version
/Users/aaron/.local/gel/3.2.0+0/ext/strscan-3.0.1/strscan.bundle: warning: already initialized constant StringScanner::Id
/Users/aaron/.local/gel/ruby/gems/timeout-0.2.0/lib/timeout.rb:26: warning: already initialized constant Timeout::VERSION
/Users/aaron/.rubies/arm64/ruby-trunk/lib/ruby/3.2.0+0/timeout.rb:26: warning: previous definition of VERSION was here
/Users/aaron/.local/gel/ruby/gems/timeout-0.2.0/lib/timeout.rb:53: warning: already initialized constant Timeout::THIS_FILE
/Users/aaron/.rubies/arm64/ruby-trunk/lib/ruby/3.2.0+0/timeout.rb:53: warning: previous definition of THIS_FILE was here
/Users/aaron/.local/gel/ruby/gems/timeout-0.2.0/lib/timeout.rb:54: warning: already initialized constant Timeout::CALLER_OFFSET
/Users/aaron/.rubies/arm64/ruby-trunk/lib/ruby/3.2.0+0/timeout.rb:54: warning: previous definition of CALLER_OFFSET was here
/Users/aaron/.local/gel/3.2.0+0/ext/strscan-3.0.1/strscan.bundle: warning: already initialized constant StringScanner::Version
/Users/aaron/.local/gel/3.2.0+0/ext/strscan-3.0.1/strscan.bundle: warning: already initialized constant StringScanner::Id
      create  
      create  Gemfile
         run  bundle install
/Users/aaron/git/gel/lib/gel/compatibility/rubygems.rb:234:in `bin_path': Unknown gem "bundler" (RuntimeError)
	from /Users/aaron/git/rails/railties/lib/rails/generators/app_base.rb:392:in `bundle_command'
	from /Users/aaron/git/rails/railties/lib/rails/generators/app_base.rb:444:in `run_bundle'
	from (eval):1:in `run_bundle'
	from /Users/aaron/git/rails/railties/lib/rails/generators/app_base.rb:431:in `target_rails_prerelease'
	from (eval):1:in `target_rails_prerelease'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/command.rb:27:in `run'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/invocation.rb:127:in `invoke_command'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `block in invoke_all'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `each'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `map'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `invoke_all'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/group.rb:232:in `dispatch'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/base.rb:485:in `start'
	from /Users/aaron/git/rails/railties/lib/rails/commands/application/application_command.rb:26:in `perform'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/command.rb:27:in `run'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor/invocation.rb:127:in `invoke_command'
	from /Users/aaron/.local/gel/ruby/gems/thor-1.2.1/lib/thor.rb:392:in `dispatch'
	from /Users/aaron/git/rails/railties/lib/rails/command/base.rb:87:in `perform'
	from /Users/aaron/git/rails/railties/lib/rails/command.rb:48:in `invoke'
	from /Users/aaron/git/rails/railties/lib/rails/cli.rb:18:in `<top (required)>'
	from /Users/aaron/git/gel/lib/gel/compatibility/rubygems.rb:251:in `require'
	from /Users/aaron/git/gel/lib/gel/compatibility/rubygems.rb:251:in `require'
	from railties/exe/rails:10:in `<main>'