fix(docker): pin alpine base + apk versions (PILOT-154)#9
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The runtime stage was using `FROM alpine:3.20` and an unpinned `apk add --no-cache ca-certificates tzdata`. Both make the produced image content non-deterministic across rebuilds — Alpine's :3.20 tag moves with patch releases, and apk pulls whatever the cdn currently offers. Pinned to alpine:3.20.6 + the current apk versions on that base: ca-certificates=20260413-r0 tzdata=2026b-r0 Bump-together comment in the Dockerfile so the next person updating knows to bump base + packages in lockstep + verify versions exist on dl-cdn before merging. Verified: `docker build .` clean (smoke test). Closes PILOT-154
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Make the runtime image reproducible by pinning the Alpine base patch level and apk package versions.
Changes:
FROM alpine:3.20→FROM alpine:3.20.6apk add --no-cache ca-certificates tzdata→ explicit=versionpins for bothBlast radius: small. Rebuilds become deterministic. Risk: if the pinned package versions get retired from the Alpine cdn the next rebuild fails — mitigated by the in-file comment instructing the bumper to verify versions exist + update base + packages together.
Verification:
docker build .clean.Closes PILOT-154