Enable ARM64 support across all Docker build targets

Signed-off-by: Davanum Srinivas <[email protected]>

Author: dims

.github/actions/build-container/action.yml

@@ -59,7 +59,6 @@ runs:
         SAFE_REF_NAME: ${{ inputs.safe_ref_name }}
         NVCR_CONTAINER_REPO: ${{ inputs.nvcr_container_repo }}
         NGC_ORG: ${{ inputs.container_org }}
-        PLATFORMS: 'linux/amd64'  # Only amd64 for faster PR validation
         DOCKER_BUILDKIT: 1
         BUILDX_CACHE_FROM: type=local,src=/tmp/.buildx-cache
         BUILDX_CACHE_TO: type=local,dest=/tmp/.buildx-cache-new,mode=max

common.mk

@@ -191,7 +191,7 @@ docker-build: setup-buildx
 docker-build-local: setup-buildx
 	@echo "Building Docker image for $(MODULE_NAME) (local, no remote cache)..."
 	cd $(REPO_ROOT) && docker buildx build \
-		--platform linux/amd64 \
+		--platform $(PLATFORMS) \
 		--network=host \
 		$(DOCKER_EXTRA_ARGS) \
 		--load \