mirror of
https://github.com/Kpa-clawbot/meshcore-analyzer.git
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99029e41aa
## Problem
`docker pull` on ARM devices fails because the published image is
amd64-only.
## Fix
Enable multi-arch Docker builds via `docker buildx`. **Builder stage
uses native Go cross-compilation; only the runtime-stage `RUN` steps use
QEMU emulation.**
### Changes
| File | Change |
|------|--------|
| `Dockerfile` | Pin builder stage to `--platform=$BUILDPLATFORM`
(always native), accept `ARG TARGETOS`/`ARG TARGETARCH` from buildx, set
`GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0` on every `go build` |
| `.github/workflows/deploy.yml` | Add `docker/setup-buildx-action@v3` +
`docker/setup-qemu-action@v3` (latter needed only for runtime-stage
RUNs), set `platforms: linux/amd64,linux/arm64` |
### Build architecture
- **Builder stage** (`FROM --platform=$BUILDPLATFORM
golang:1.22-alpine`) — runs natively on amd64. Go toolchain
cross-compiles the binaries to `$TARGETARCH` via `GOOS/GOARCH`. No
emulation, ~10× faster than emulated builds. Works because
`modernc.org/sqlite` is pure Go (no CGO).
- **Runtime stage** (`FROM alpine:3.20`) — buildx pulls the per-arch
base. RUN steps (`apk add`, `mkdir/chown`, `chmod`) execute inside the
target-arch image, so QEMU is required to interpret arm64 binaries on
the amd64 host. Only a handful of short shell commands run under
emulation, so the QEMU cost is small.
### Verify
After merge, on an ARM device:
```bash
docker pull ghcr.io/kpa-clawbot/corescope:edge
docker inspect ghcr.io/kpa-clawbot/corescope:edge --format '{{.Architecture}}'
# → arm64
```
> First arm64 image appears on the next push to master after this
merges.
Closes #768
---------
Co-authored-by: you <you@example.com>
Co-authored-by: Kpa-clawbot <agent@corescope.local>