RFC: add Phase Debug Script

[BarDweller]

Suggestion to add ability to drive a debug script instead of the lifecycle binaries during a build, for debug purposes.

Link for reading : https://github.com/BarDweller/buildpacks-rfcs/blob/main/text/0000-pack-phase-debug-script.md

[buildpack-bot]

Maintainers,

As you review this RFC please queue up issues to be created using the following commands:

/queue-issue <repo> "<title>" [labels]...
/unqueue-issue <uid>

Issues

(none)

[natalieparellano]

I love this idea. This would greatly help in debugging all kinds of issues.