hack/buildkitd.toml

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# BuildKit daemon config for CI builds.
#
# Route docker.io base-image pulls through mirror.gcr.io, Google's public
# pull-through cache for Docker Hub. The Build job authenticates only to the
# push registry (OCIR), so every base image (golang, alpine, ubuntu, nginx, ...)
# is otherwise pulled from Docker Hub ANONYMOUSLY and is subject to Docker Hub's
# anonymous-pull rate limit -- which intermittently fails the build at
# auth.docker.io/token with the base image left unresolved.
#
# mirror.gcr.io needs no auth, carries far higher limits, and transparently
# falls through to Docker Hub on a cache miss. This config only takes effect on
# a buildx builder created with `--config hack/buildkitd.toml` (CI wires this via
# docker/setup-buildx-action `buildkitd-config:`); a plain local `make build` on
# the default builder is unaffected.
#
# FAIL-SAFE: if mirror.gcr.io is unreachable, BuildKit logs "trying next host"
# and falls back to registry-1.docker.io, so the build still succeeds (verified:
# a build pointed at a non-resolving mirror fell back to Docker Hub and exited 0).
# This strictly reduces build failures; it never introduces a new hard dependency.
[registry."docker.io"]
  mirrors = ["mirror.gcr.io"]