[release-22.0] docker: use shared buildkit cache scope for bootstrap images (#19770)#19778
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Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Description
This is a backport of #19770