ppc64le/multi-arch support for operator image

[jcho02]

IBM Power (ppc64le) and multi-arch build for the operator image.
Also including ppc64le support tag to the CSV file for operator appear on the OperatorHub in ppc64le arch based OCP clusters.

[jcho02]

Thank you Michael for the feedback, made changes accordingly to your comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ee6d06d) 85.12% compared to head (1873e5b) 85.12%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #220   +/-   ##
=======================================
  Coverage   85.12%   85.12%           
=======================================
  Files          13       13           
  Lines        2730     2730           
=======================================
  Hits         2324     2324           
  Misses        325      325           
  Partials       81       81           

Flag	Coverage Δ
unittests	85.12% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ee6d06d...1873e5b. Read the comment docs.

[maskarb]

@jcho02
This PR looks totally fine to me, but before we merge it, we need to figure out how we are going to actually build the multi-arch images. The upstream images are currently built in quay.io when PRs are merged and releases are published. It doesn't seem like the quay.io runners support multi-arch image building, so we will need to switch to something else (like a Github action) to accomplish that.

[jcho02]

Added a workflow to build and push images onto quay

[maskarb]

@jcho02 I went ahead and implemented a build/push pipeline in this PR: #231, so feel free to back those changes out of this PR.

If you could run the latest image (quay.io/project-koku/koku-metrics-operator:latest or quay.io/project-koku/koku-metrics-operator@sha256:623a054331239a17c8aaeaa906a7ee7407a6e4ea906b24c1f2c706351b804b4b) on Power to confirm it compiles correctly for that arch, that would be great.

[jcho02]

Thanks @maskarb I verified the image and the operator builds on power platforms.