Workhorse: reduce ubi8 size by relocating chown/chgrp

What does this MR do?

Reduce the size of the fimal image for Workhorse by relocating any chown, chmod, or chgrp on built assets from the final image to a build stage.

Impact

image	tag	size (skopeo)	size (docker)
gitlab-workhorse-ee	master-ubi8	686,323,732	1,652,115,417
gitlab-workhorse-ee	workhorse-reduce-chown-ubi8	442,874,360	1,102,858,126
	DIFF	243,449,372	549,257,291
gitlab-workhorse-ee	gitlab-base-ubi8*	402,626,268	991,058,829
	DIFF (additional)	40,248,092	111,799,297

Two sizes are listed:

• Skopeo listed the total compresses layer sizes (storage / transit)
• Docker lists the total uncompressed layer sizes (consumption / usage)

Supplemental: When we change the base image from gitlab-ruby to gitlab-base, we gain that reduction as well.

Related issues

Relates to gitlab-org/charts/gitlab#2973 (closed)

Relates to gitlab-org/charts/gitlab#3268

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated