[2.8] Update push-to-master.yaml

[rawagner]

Do not push assisted-ui quay.io images created after a new CIM release

backport of https://github.com/openshift-assisted/assisted-installer-ui/commit/a3014139bb92f168597e7e3e6ae5e6dc27b4f99d

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ammont82, jkilzi, rawagner

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[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.