Author	SHA1	Message	Date
pat-s	09536cddd6	feat(build): raise BuildKit cache-mount budget for remote builders (#112) ... BuildKit's default GC caps the ephemeral cache tier — `RUN --mount=type=cache` mounts, local build context, git checkouts — at a hardcoded **512 MB** (shown as `488.3 MiB` in `buildx inspect`). Across our 7-distro build matrix that fills instantly and forces re-downloads of system + R packages on every rebuild. ## Changes - **`docker/buildkitd.toml`** (new) — GC config passed via `--config` when creating the `docker-container` builders `artemis` (amd64) and `gaia` (arm64): - cache-mount tier: **512 MB → 8 GB**, retained 7 days - total cache bounded at **40 GB** with **20 GB min-free** - **`justfile`** — document the `--config docker/buildkitd.toml` flag on the builder-create commands so a recreate does not silently revert to the 512 MB default. ## Notes - Limits are absolute (not `%`) because the two hosts differ ~6× in free space (Hetzner ~42 GiB free vs Mac mini ~279 GiB). The 20 GB min-free is the safety valve on the disk-tight Hetzner host; the old default wanted 64 GiB free, which does not exist there. - Both live builders were already recreated with this config and verified running. Reviewed-on: #112	2026-07-08 08:22:03 +00:00