standalone: fix portability for arm64 platforms

On Linux, uname -m reports "aarch64" (vs. the "arm64" reported on
macOS).

Signed-off-by: Jacob Howard <jacob.howard@docker.com>

Author: xenoscopic

Dockerfile

@@ -2,7 +2,7 @@
 
 ARG GO_VERSION=1.24.2
 ARG LLAMA_SERVER_VERSION=latest
-ARG LLAMA_BINARY_PATH=/com.docker.llama-server.native.linux.cpu.amd64
+ARG LLAMA_BINARY_PATH=/com.docker.llama-server.native.linux.cpu.${TARGETARCH}
 
 FROM golang:${GO_VERSION}-bookworm AS builder
 

Makefile

@@ -3,7 +3,7 @@ APP_NAME := model-runner
 GO_VERSION := 1.23.7
 LLAMA_SERVER_VERSION := v0.0.4-cpu
 TARGET_OS := linux
-TARGET_ARCH := $(shell uname -m 2>/dev/null || echo "amd64")
+TARGET_ARCH := $(shell uname -m 2>/dev/null | sed 's/aarch64/arm64/g' || echo "amd64")
 ACCEL := cpu
 DOCKER_IMAGE := go-model-runner:latest
 LLAMA_BINARY := /com.docker.llama-server.native.$(TARGET_OS).$(ACCEL).$(TARGET_ARCH)