use ubi instead of scratch

[jianzhangbjz]

I'm not sure if I should modify the downstream directly, but some users have conerns when using the scratch, especially when building the multi-arch image. They have to modify the Dockfile after opm alpha bundle generate xxx. They will get an error if they forget to update the base image. So, I just submitted this PR, any comments are welcome! Thanks!

[yapei@yapei-mac apicast (operators)]$ opm alpha bundle validate --tag quay.io/yapei/apicast-operators-bundle:latest --image-builder podman
Command "validate" is deprecated, This subcommand is deprecated and will be removed in a future release. Migrate to operator-sdk bundle validate
INFO[0000] Create a temp directory at /var/folders/gw/6ckgw32n7rz4yncmkkpsvjl80000gn/T/bundle-2170207577  container-tool=podman
DEBU[0000] Pulling and unpacking container image         container-tool=podman
INFO[0000] running /opt/podman/bin/podman pull quay.io/yapei/apicast-operators-bundle:latest  container-tool=podman
ERRO[0002] Trying to pull quay.io/yapei/apicast-operators-bundle:latest...
Error: choosing an image from manifest list docker://quay.io/yapei/apicast-operators-bundle:latest: no image found in image index for architecture "amd64", variant "", OS "linux"  container-tool=podman
Error: error pulling image: Trying to pull quay.io/yapei/apicast-operators-bundle:latest...
Error: choosing an image from manifest list docker://quay.io/yapei/apicast-operators-bundle:latest: no image found in image index for architecture "amd64", variant "", OS "linux"
...

[openshift-ci]

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[openshift-ci]

@jianzhangbjz: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/verify	0ac959b	link	true	/test verify
ci/prow/unit-registry	0ac959b	link	true	/test unit-registry

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[grokspawn]

Hi @jianzhangbjz
You're right that we don't want to modify ./staging contents, since they get sync'd from the CNCF project and could easily get stomped on.
I'm of two minds on the subject of this alpha level feature needing support.
I think it's OK to add a new, optional flag to provide the capability, still defaulting to the existing behavior, like here. And that would be available in downstream opm versions at the latest unreleased OCP version.
But I think that we would not backport this feature functionality without a really compelling argument.
cc: @joelanford

[joelanford]

Bundles images explicitly should NOT be multi-arch images. They contain just plaintext files, so they are not platform-specific.

Only images that contain executable binaries need to be multi-arch. And the manifests inside of a bundle images should always reference the multi-arch manifest of the controller and related images.

Is the validate bundle command failing on scratch-based bundle images?