* ci(docker): publish multi-arch image (linux/amd64 + linux/arm64)
Apple Silicon users hit "no matching manifest for linux/arm64/v8"
when running `docker compose up -d` because the publish workflow
defaulted to the GHA runner's native arch (amd64). Add a QEMU setup
step and tell buildx to emit both linux/amd64 and linux/arm64
manifests under the same tag.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* docs(self-hosting): drop stale migration file count
The doc claimed "63 ordered SQL files" — actual count is ~210 and
growing every release. Removing the specific number so it stops drifting.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
