OCPBUGS-3469: Multi-arch support

[oceanc80]

Add configurable multi-arch build support

[everettraven]

These changes currently don't work when attempting to initialize a project using operator-sdk init .... I left a comment showing the error I received and what I think the solution is.

Another thing I noticed is there is a few commits with multiple contributors and looks like it would re-commit a few already merged commits. I think a git rebase (or similar operation) may have gone a bit off the rails as I would have only expected the Makefile template and the testdata to be updated by this PR.

[laxmikantbpandhare]

/lgtm

I will try updated tutorial steps on the weekend.

[everettraven]

So I think the changes look good and make sense, but I just can't seem to get an image to actually be built when running make docker-build. However, this isn't unique to this PR and also happens when trying to run make docker-build on the testdata/quarkus/memcached-quarkus-operator sample on the main branch.

[everettraven]

/lgtm