PR #547 refreshed the sensing-server docker publish and the README badge
advertises 'Docker: multi-arch amd64 + arm64', but
.github/workflows/sensing-server-docker.yml only sets
'platforms: linux/amd64'. The arm64 layer was never actually wired in.
Consequence on Docker Hub today (ruvnet/wifi-densepose:latest, last pushed
2026-05-14 by #547):
$ curl -s https://hub.docker.com/v2/repositories/ruvnet/wifi-densepose/tags/latest/
images:
arch=amd64 os=linux
arch=unknown os=unknown # the 1.5KB attestation layer, not arm64
So Apple Silicon Macs (the platform in #625) hit:
docker pull ruvnet/wifi-densepose:latest
Error: no matching manifest for linux/arm64/v8 in the manifest list
This is the same crash class as the closed-unmerged #136 'Docker error on
MacOS'; #625 is a fresh report (Mac M3 Pro, macOS Tahoe 26.4.1) of the same
bug.
Fix is the standard buildx multi-arch recipe:
1. Add docker/setup-qemu-action@v3 before setup-buildx so the amd64 runner
can cross-build the arm64 layer (QEMU user-mode emulation).
2. Change 'platforms: linux/amd64' -> 'platforms: linux/amd64,linux/arm64'.
docker/Dockerfile.rust is already arch-agnostic — no '--target' flag, no
amd64-only Cargo deps, only 'cc = "1.0"' which is cross-aware — so no
Dockerfile changes are needed. Buildx + QEMU does the rest.
Smoke tests are unaffected: they 'docker pull' on ubuntu-latest (amd64), so
the runner auto-selects the amd64 entry from the multi-arch manifest.
Multi-arch manifests are transparent to single-arch consumers.
Scope discipline: this PR only touches sensing-server-docker.yml (the file
issue #625 is about). nvsim-server-docker.yml has the identical
'platforms: linux/amd64' bug but is out of scope here — happy to file
a follow-up if useful.
Note (not part of this fix): the last 5 runs of this workflow have failed
at the 'Log in to Docker Hub' step (DOCKERHUB_TOKEN secret looks rotated/
expired). That's a separate, secret-side issue I can't touch from a PR.
Once that's resolved, the next push to main will produce a proper
amd64+arm64 manifest for the first time.
Co-authored-by: Mack Ding <mack@claws.ltd>
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