use cross compiling

Author: motoki317

Dockerfile

@@ -1,21 +1,25 @@
-FROM golang:1.19-alpine as gobuild
+# Golang can cross-compile
+FROM --platform=$BUILDPLATFORM golang:1.19-alpine as gobuild
 
 WORKDIR /build
 ADD go.mod go.sum /build/
 RUN go mod download -x
 ADD cmd /build/cmd
 ADD pkg /build/pkg
-RUN CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' -o ./s3driver ./cmd/s3driver
 
-FROM alpine:3.17 AS downloader
+ARG TARGETOS
+ARG TARGETARCH
+RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -a -ldflags '-extldflags "-static"' -o ./s3driver ./cmd/s3driver
+
+FROM --platform=$BUILDPLATFORM alpine:3.17 AS downloader
 
 WORKDIR /work
 
 RUN apk add --no-cache curl
 
-ARG TARGETPLATFORM
-RUN ARCH=$(echo $TARGETPLATFORM | sed -e 's/^linux\///g') && \
-    curl https://github.com/yandex-cloud/geesefs/releases/latest/download/geesefs-linux-$ARCH -LfSso /work/geesefs
+ARG TARGETOS
+ARG TARGETARCH
+RUN curl https://github.com/yandex-cloud/geesefs/releases/latest/download/geesefs-$TARGETOS-$TARGETARCH -LfSso /work/geesefs
 
 FROM alpine:3.17
 LABEL maintainers="Vitaliy Filippov <vitalif@yourcmc.ru>"