Add s390x architecture support for RDMA CNI image build.

[ashokpariya0]

Fixes: #111

[SchSeba]

Hi @ashokpariya0 can you help us switch this project like the sriov-network-operator for example that all the builds has the same tag.

thanks!

[ashokpariya0]

Hi @ashokpariya0 can you help us switch this project like the sriov-network-operator for example that all the builds has the same tag.

thanks!

Yes, sure — I’ll take care of that. We need to do this for the following components as well.
sriov-network-device-plugin, rdma-cni, and ib-sriov-cni.

Currently, our workflow builds and tags images separately for each architecture (latest-amd64, latest-arm64, latest-ppc64le etc, and then combines them into a single latest tag.
We’re also maintaining multiple Dockerfiles (Dockerfile, Dockerfile.arm64, Dockerfile.ppc64le, etc.),
which isn’t really needed.

Can I request you to merge this PR so I can get a build for s390x?
I’d like to run some sanity testing, and then as a next step, I can convert the image into a proper multi-arch build with a single unified tag.

[ashokpariya0]

Hi @ashokpariya0 can you help us switch this project like the sriov-network-operator for example that all the builds has the same tag.

Done, PR: #113