Fixups for pack 0.30.0

[natalieparellano]

Summary

Similar to buildpacks/lifecycle#1057, this issue is meant to capture small bugs to be fixed before we can ship the next pack.

TODO:

• ...add more here...

In flight:

• Fix log message when buildpack doesn't satisfy target constraints for builder #1801 - This error message is a bit hard to follow and should be improved: ERROR: validating buildpacks: buildpack samples/[email protected] does not support target: (linux amd64, @)
• Fix: deriving stack.toml from the new run image information #1788 - $ docker run -it --rm test-builder cat /cnb/stack.toml sometimes shows image = "cnbs/sample-stack-run:jammy" and sometimes shows [run-image]\nimage = "cnbs/sample-stack-run:jammy" - we think the former is correct; the difference shows up depending on how base information is specified in builder.toml ([stack] only, [run] only, or both)
• Stack fix & create new volume cache for kaniko instead of re-using build cache #1789 - pack should create a new volume cache for kaniko instead of re-using the layers cache (and erroring if the layers cache isn't a volume cache)

Done:

• We need to provide -run /layers/run.toml to the detector Actually, we don't need to do this. The detector is running in the context of the builder image (not the lifecycle image), so run.toml is already present at the default location of /cnb/run.toml

[natalieparellano]

Closing as the linked PRs have been merged