Add mutli arch build and manifest for the operator repo

[msherif1234]

MULTIARCH_TARGETS="ppc64le s390x" BPFMAN_AGENT_IMG=quay.io/bpfman/bpfman-agent:lastest BPFMAN_OPERATOR_IMG=quay.io/bpfman/bpfman-operator:latest make build-images

will result in

quay.io/bpfman/bpfman-agent      lastest-s390x      d0e6f5097fd1   About a minute ago   471MB
quay.io/bpfman/bpfman-agent      lastest-ppc64le    c9953f679b4a   4 minutes ago        585MB
quay.io/bpfman/bpfman-operator   latest-s390x       78079918de28   14 minutes ago       177MB
quay.io/bpfman/bpfman-operator   latest-ppc64le     7ec1a6abcb74   15 minutes ago       238MB

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 26.38%. Comparing base (eb341c4) to head (c2f4b4b). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #11 +/- ## ======================================= Coverage 26.38% 26.38% ======================================= Files 75 75 Lines 5021 5021 ======================================= Hits 1325 1325 Misses 3532 3532 Partials 164 164 ``` | [Flag](https://app.codecov.io/gh/bpfman/bpfman-operator/pull/11/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bpfman) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/bpfman/bpfman-operator/pull/11/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bpfman) | `26.38% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bpfman#carryforward-flags-in-the-pull-request-comment) to find out more.

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[astoycos]

LGTM