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`--cache-to type=inline` only exports the final stage. 25 of 38 Dockerfiles are multistage, so the expensive `builder` stages (Go/Node compiles) were never cached even with a warm tag. Switch every image to a shared mode=max registry cache. - New `cache-args` macro (hack/common-envs.mk) emits `--cache-from` always and `--cache-to … mode=max` only when WRITE_CACHE=1, so PR builds stay read-only and concurrent PRs never race on the cache ref (the 409 class #2711 fixed for tags). oci-mediatypes/image-manifest keep the cache manifest portable across registries. - Cache ref is CACHE_REGISTRY/<img>:buildcache, co-located with the build registry (CACHE_REGISTRY now defaults to $(REGISTRY)). - New build-main.yaml warms :buildcache on every push to main (WRITE_CACHE=1), serialized via concurrency. All 31 package image recipes converted from the inline cache-from/cache-to pair to `$(call cache-args,…)`; ubuntu-container-disk keeps a per-k8s-version cache tag. Verified with `make -n image` across all packages in both PR (read-only) and main (mode=max write) contexts. Part of #2937. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>