alpine arch in dockerfile

gistfile1.txt

https://github.com/docker-library/golang/blob/f300e60ca19c3b98cfcf01ca112af2ac10104320/1.17-rc/alpine3.14/Dockerfile#L30

	apkArch="$(apk --print-arch)"; \
	case "$apkArch" in \
		'x86_64') \
			export GOARCH='amd64' GOOS='linux'; \
			;; \
		'armhf') \
			export GOARCH='arm' GOARM='6' GOOS='linux'; \
			;; \
		'armv7') \
			export GOARCH='arm' GOARM='7' GOOS='linux'; \
			;; \
		'aarch64') \
			export GOARCH='arm64' GOOS='linux'; \
			;; \
		'x86') \
			export GO386='softfloat' GOARCH='386' GOOS='linux'; \
			;; \
		'ppc64le') \
			export GOARCH='ppc64le' GOOS='linux'; \
			;; \
		's390x') \
			export GOARCH='s390x' GOOS='linux'; \
			;; \
		*) echo >&2 "error: unsupported architecture '$apkArch' (likely packaging update needed)"; exit 1 ;; \
	esac; \