USHIFT-4025: Implement MicroShift image mode container build procedure

[ggiguash]

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[openshift-ci-robot]

@ggiguash: This pull request references USHIFT-4025 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.18.0" version, but no target version was set.

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[openshift-ci[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[joepvd]

packaging/imagemode/Containerfile.repobase looks like a usable Containerfile to productize this.

[pmtk]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, pmtk

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[openshift-ci[bot]]

@ggiguash: all tests passed!

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