feat(examples/buildx_arm64): Create cross platform build example using buildx

Author: ondrejsika

examples/buildx_arm64/Dockerfile

@@ -0,0 +1,7 @@
+FROM debian:12
+WORKDIR /app
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl ca-certificates && \
+    rm -rf /var/lib/apt/lists/*
+COPY install.sh .
+RUN sh install.sh

examples/buildx_arm64/Makefile

@@ -0,0 +1,18 @@
+default: build-and-load
+
+all: create-builder build-and-load build-and-push run
+
+install-deps-debian:
+	apt-get install -y qemu qemu-user-static binfmt-support
+
+create-builder:
+	docker buildx create --name mybuilder --use
+
+build-and-load:
+	docker buildx build . --platform linux/arm64 -t ttl.sh/slu-arm64 --load
+
+build-and-push:
+	docker buildx build . --platform linux/arm64 -t ttl.sh/slu-arm64 --push
+
+run:
+	docker run --rm -it ttl.sh/slu-arm64

examples/buildx_arm64/install.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+VERSION=v0.73.0 && \
+OS=linux && \
+ARCH=arm64 && \
+ORG=sikalabs && \
+BIN=slu && \
+curl -fsSL https://github.com/${ORG}/${BIN}/releases/download/${VERSION}/${BIN}_${VERSION}_${OS}_${ARCH}.tar.gz -o ${BIN}_${VERSION}_${OS}_${ARCH}.tar.gz && \
+tar -xzf ${BIN}_${VERSION}_${OS}_${ARCH}.tar.gz ${BIN} && \
+rm ${BIN}_${VERSION}_${OS}_${ARCH}.tar.gz && \
+mv ${BIN} /usr/local/bin/