Set target architecture build arg set to 'amd64' for devfile registry operator image builds

[michael-valdron]

Description

Changes to support multiple architectures for the devfile registry operator (devfile/registry-operator#68) is causing OpenShift CI testing to fail due to TARGETARCH build argument being overridden with a blank value.

This requires TARGETARCH to be manually set to the intended architecture for testing in OpenShift CI, currently only amd64.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michael-valdron

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• ci-operator/config/devfile/registry-operator/OWNERS [michael-valdron]

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[michael-valdron]

/pj-rehearse

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@michael-valdron: the pj-rehearse plugin accommodates running rehearsal tests for the changes in this PR. Expand 'Interacting with pj-rehearse' for usage details. The following rehearsable tests have been affected by this change:

Test name	Repo	Type	Reason
pull-ci-devfile-registry-operator-release-v0-v4.12-images	devfile/registry-operator	presubmit	Ci-operator config changed
pull-ci-devfile-registry-operator-release-v0-v4.12-registry-operator-integration-test	devfile/registry-operator	presubmit	Ci-operator config changed
pull-ci-devfile-registry-operator-main-v4.12-images	devfile/registry-operator	presubmit	Ci-operator config changed
pull-ci-devfile-registry-operator-main-v4.12-registry-operator-integration-test	devfile/registry-operator	presubmit	Ci-operator config changed

Interacting with pj-rehearse

Comment: /pj-rehearse to run up to 5 rehearsals
Comment: /pj-rehearse skip to opt-out of rehearsals
Comment: /pj-rehearse {test-name}, with each test separated by a space, to run one or more specific rehearsals
Comment: /pj-rehearse more to run up to 10 rehearsals
Comment: /pj-rehearse max to run up to 25 rehearsals
Comment: /pj-rehearse auto-ack to run up to 5 rehearsals, and add the rehearsals-ack label on success
Comment: /pj-rehearse abort to abort all active rehearsals

Once you are satisfied with the results of the rehearsals, comment: /pj-rehearse ack to unblock merge. When the rehearsals-ack label is present on your PR, merge will no longer be blocked by rehearsals.
If you would like the rehearsals-ack label removed, comment: /pj-rehearse reject to re-block merging.

[michael-valdron]

/pj-rehearse

[michael-valdron]

Folded these changes into #46895.