Three sources of unbounded growth removed:
- Drop cache-from/cache-to registry: on a persistent self-hosted runner the
local BuildKit layer cache already provides between-run reuse; the registry
cache was redundant and pushed ~2 GB of torch layers on every build
- Switch docker system prune -f → -af so old :SHA-tagged images are removed,
not just dangling ones (-f alone never touched named tags)
- Add docker builder prune --keep-storage 5g to bound the local BuildKit
cache; pip mount cache (torch etc.) is recently-used so survives, stale
intermediate layers are evicted first
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
bvandeusen
3e42992f67