OCPBUGS-57473: create digest configmap without oc binary

[cheesesashimi]

- What I did

This is a different implementation for the problem discussed in #5313 . Instead of including the oc binary in the MCO image or extracting it from the build process, this does the following:

• Creates a new create-digest-configmap subcommand onto the machine-os-builder command.
• Modifies the create-digest-configmap.sh script to call this new subcommand instead of requiring oc.

This should result in a smaller overall MCO image as well as eliminating the need to use the oc binary.

- How to verify it

The image build process should continue to work as-is, meaning that the current E2E test suites should be able to verify it.

- Description for the changelog
Create digest configmap without oc binary

[openshift-ci]

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[openshift-ci-robot]

@cheesesashimi: This pull request references Jira Issue OCPBUGS-57473, which is invalid:

• expected the bug to target either version "4.22." or "openshift-4.22.", but it targets "4.21.z" instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

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In response to this:

- What I did

- How to verify it

- Description for the changelog

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheesesashimi

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[cheesesashimi]

/test e2e-gcp-op-ocl
/test e2e-gcp-op-ocl-part1
/test e2e-gcp-op-ocl-part2

[cheesesashimi]

/test unit
/test verify

[openshift-ci]

@cheesesashimi: all tests passed!

Full PR test history. Your PR dashboard.

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