NO-ISSUE: Make Containerfile.repobase self contained to be used in build pipelines

[ggiguash]

Konflux pipelines do not allow for checking our repositories and copying external files when building container images.

[openshift-ci-robot]

@ggiguash: This pull request explicitly references no jira issue.

In response to [this](https://github.com/openshift/microshift/pull/3887): >Konflux pipelines do not allow for checking our repositories and copying external files when building container images. Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fmicroshift). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[ggiguash]

/override ci/prow/microshift-metal-tests ci/prow/microshift-metal-tests-arm

[ggiguash]

/hold

[openshift-ci[bot]]

@ggiguash: Overrode contexts on behalf of ggiguash: ci/prow/microshift-metal-tests, ci/prow/microshift-metal-tests-arm

In response to [this](https://github.com/openshift/microshift/pull/3887#issuecomment-2338479051): >/override ci/prow/microshift-metal-tests ci/prow/microshift-metal-tests-arm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[thegreyd]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/microshift/blob/main/OWNERS)~~ [ggiguash] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ggiguash]

/unhold /override ci/prow/microshift-metal-tests ci/prow/microshift-metal-tests-arm

[openshift-ci[bot]]

@ggiguash: Overrode contexts on behalf of ggiguash: ci/prow/microshift-metal-tests, ci/prow/microshift-metal-tests-arm

In response to [this](https://github.com/openshift/microshift/pull/3887#issuecomment-2338810754): >/unhold >/override ci/prow/microshift-metal-tests ci/prow/microshift-metal-tests-arm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[openshift-ci[bot]]

@ggiguash: all tests passed!

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Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).