Prow build tests for Backstage stuff

[aliok]

Which issue(s) this PR fixes:

Fixes

[dsimansk]

Ali, looks good to me. Check is passing, it should be fine. Also assuming that the script exists /test/presubmit-tests.sh on the backstage side.

/approve
/lgtm

/hold for other reviews

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aliok, dsimansk

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[pierDipi]

/unhold

[knative-prow]

@aliok: Updated the job-config configmap in namespace default at cluster default using the following files:

• key backstage-plugins-main.gen.yaml using file prow/jobs/generated/knative-extensions/backstage-plugins-main.gen.yaml

In response to this:

Which issue(s) this PR fixes:

Fixes

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