Revert "Push multi-arch docker image (#76)"

[njhill]

This reverts commit d9892e3.

These changes actually broke our main image build. Unfortunately the actions that run on the PR don't actually build the image. @ckadner is addressing that and then we can reopen this if needed post 0.10 release.

@ddelange it probably only makes sense anyhow if we do this for all the modelmesh images i.e. also including modelmesh-serving and modelmesh-runtime-adapter

[ckadner]

/lgtm

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[ddelange]

ah damn, looks like there's an upstream image that does not build for arm64, sorry about that

[ddelange]

this is weird, should be available according to the manifest

$ dockersize registry.access.redhat.com/ubi8/ubi-minimal:8.6
linux/amd64    37.82M
linux/arm64    36.16M
linux/ppc64le  42.24M
linux/s390x    36.12M

let me try to build the branch on my fork