new-action-cache: rootless containers cannot read actions due to access level

[ChristopherHX]

This is behind a feature flag and doesn't cause problems unless explicit opt in

Using rootful container avoids the problem

[ChristopherHX]

ls shows this

total 0
-????????? ? ? ? ?            ? CODE_OF_CONDUCT.md
-????????? ? ? ? ?            ? CONTRIBUTING.md
-????????? ? ? ? ?            ? LICENSE
-????????? ? ? ? ?            ? README.md
d????????? ? ? ? ?            ? __tests__
-????????? ? ? ? ?            ? action.yml
d????????? ? ? ? ?            ? dist
d????????? ? ? ? ?            ? docs
-????????? ? ? ? ?            ? jest.config.js
-????????? ? ? ? ?            ? package-lock.json
-????????? ? ? ? ?            ? package.json
d????????? ? ? ? ?            ? src
-????????? ? ? ? ?            ? tsconfig.json

Permission bits of tar has failed badly.