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Aleksei Sviridkin 084ac47237 feat(build): build published images for amd64 and arm64 by default
PLATFORM defaulted to empty, so buildx built for the host alone. On an
arm64 workstation `make image` published an arm64-only digest, which
amd64 nodes then fail to pull; the cilium pin shipped exactly that
until it was rebuilt by hand. A build now targets linux/amd64 and
linux/arm64 unless PLATFORM is set, and the digest a package stamps is
the index digest.

LOAD=1 keeps building for the host only. The classic docker image store
cannot load a multi-platform index, and loading is the documented local
workflow.

This changes local pushes: a `make image` on the default docker driver
without the containerd image store now fails with "Multi-platform build
is not supported for the docker driver", where it used to build for
the host. Such a build needs a docker-container builder (BUILDER), or
LOAD=1 or an explicit PLATFORM for a single architecture.

talos and testing pin linux/amd64 with `override`, placed before the
include because common-envs.mk expands BUILDX_ARGS immediately. The
Talos assets are amd64: matchbox bakes the kernel and initramfs into
its image, and the e2e sandbox boots the disk under qemu-system-x86_64.
An arm64 variant of either would still serve or boot amd64 files.

CI pins linux/amd64 on every image build. Nothing there sets up QEMU,
fork builds export a single-platform archive, and tags.yaml builds on
the default docker driver, so the default would break or emulate those
jobs. Native arm64 builds belong in a leg of their own.

Assisted-by: LLM
Signed-off-by: Aleksei Sviridkin <f@lex.la>
2026-09-26 15:14:12 +03:00
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