Draft: Use releng's buildkit infra for building our Dockerfile
Depends on workflow_utils!36.
See https://wikimedia.slack.com/archives/C03AKSE0WAX/p1673032174692729 for context.
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Depends on workflow_utils!36.
See https://wikimedia.slack.com/archives/C03AKSE0WAX/p1673032174692729 for context.