Add docker rootless feature flag and its implementation for supporting docke rootless environment

[kimsehwan96]

resolve: #817

Add feature flag dockerRootless and default value false.

Change lib/pip.js file permission change logic for supporting docker rootless environment.

I think that its better add some document about this in README.md

[pgrzesik]

Hey @kimsehwan96 👋 Thanks a lot for your contribution - do you think it would be possible to cover this by test by any chance, or it's gonna be rather hard to include in the testing suite?

[kimsehwan96]

Hello @pgrzesik . I think that this change should be tests in CI(Github action) level. Becasue it doesn't work that we expected when enable that feature flag in Not rootless docker environment.

I will find how to test it in unit test or CI level test in github action. I think that it will not very hard to include this in the testing suite!

[pgrzesik]

Hey @kimsehwan96 👋 Could you fix the formatting as listed in the failed CI build? I think having automated tests for this would be tricky, but let's make sure it's not breaking anything else in the process 👍

[kimsehwan96]

Hello @pgrzesik . Sorry for late works.. As you mentioned, apply automated tests for this change is tricky. I underestimated about it 🥲. And I failed to devote much of time.

By the way, I will applying the formatting and inform about it to you.

When I have some free time from the coming week, I will append some comment about which cases of environment this will be needed with some detailed information.

Thank you !

[kimsehwan96]

I applied formatting for this change ! @pgrzesik

I want to merge 2 commits which are for applying dockerRootless option and prettier . So I rebased and squashed 2 commits into 1 and force pushed to this branch. Is it okay?

[pgrzesik]

Thank you @kimsehwan96 🙇