Pins all FROM image tags to exact SHA256 digests for reproducible
builds. Without digest pinning, a registry push of a new image to the
same tag can silently change the layer content between builds — a
supply-chain risk especially for prod-deployed images.
Pinned images (7 Dockerfiles):
- golang:1.25-alpine → sha256:c4ea15b... (workspace-server/Dockerfile,
Dockerfile.dev, Dockerfile.tenant, tests/harness/cp-stub/Dockerfile)
- alpine:3.20 → sha256:c64c687c... (workspace-server/Dockerfile,
tests/harness/cp-stub/Dockerfile)
- node:20-alpine → sha256:afdf982... (workspace-server/Dockerfile.tenant)
- node:22-alpine → sha256:cb15fca... (canvas/Dockerfile)
- python:3.11-slim → sha256:e78299e... (workspace/Dockerfile)
- nginx:1.27-alpine → sha256:62223d6... (tests/harness/cf-proxy/Dockerfile)
Note: docker-compose.yml service images (postgres, redis, clickhouse,
litellm, ollama) are intentionally left on major-version tags — those
are runtime-pulled and updated regularly for local-dev ergonomics.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
