The orchestrator/gateway container split retired the docker backend's combined
`bot-bottle-infra` container, leaving `Dockerfile.infra` used only as the base
layer for the firecracker rootfs image — and its header still (falsely) claimed
"used directly by the Docker backend."
Fold its one `COPY --from orchestrator` into `Dockerfile.infra.fc` (now
`FROM bot-bottle-gateway` directly + the copy + buildah), delete Dockerfile.infra,
and drop the now-dead build step + artifact-version entry. `build_infra_images_with_docker`
builds three images instead of four; the firecracker rootfs is unchanged in
content (still gateway + orchestrator package + buildah, one artifact).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
didericis
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