[ruby-core:94216] [Ruby master Feature#16090] RUBY_ON_BUG envval to debug

Issue #16090 has been reported by ko1 (Koichi Sasada).

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Feature #16090: RUBY_ON_BUG envval to debug
https://bugs.ruby-lang.org/issues/16090

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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How about to introduce `RUBY_ON_BUG` environment variable which specify the command launched at `rb_bug()`?

`RUBY_ON_BUG='gdb -p' ruby ...`

In this case, `gdb -p [PID]` is invoked when `rb_bug()` is called.
after that, we can spy the interpreter with gdb.

https://github.com/ruby/ruby/pull/2331

On my patch, it is limited to RUBY_DEVEL build.

# Security risk

I'm not a professional about security, but it can introduce new security risk.
Comments are welcome.
This is why I made a ticket.

Thanks,
Koichi



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