Include openshift-4.12 schema.

This is coming from the most recent 4.12.z release (currently 4.12.87).

Generated using

  oc get --raw /openapi/v2 | jq --sort-keys 'del(.parameters, .paths[], .security, .securityDefinitions)' | sed -Ee 's/(Authorization: Bearer sha256)~[^ ]*/\1~REDACTED/;'

Author: Moritz Clasmeier