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This PR adds a bootstrap script and systemd service that provision a long-running BuildKit daemon on each build host. Which will dramatically reduces rebuild time by reusing cached layers across jobs.
Highlights
Persistent cache:
BuildKit stores layer data under the largest available volume (e.g. /buildkit), surviving across builds and reboots.
Dynamic GC policy:
Cache size automatically scales to ~80 % of available disk space, with recency-based pruning (configurable keep window).
Idempotent startup:
The bootstrap script installs BuildKit if missing, generates config only when needed, detects drift via diff, and restarts the daemon only when configuration changes.
Systemd integration:
Managed as buildkitd.service—auto-starts on boot, restarts on failure, no manual process management required.