Merge pull request #29098 from DieterReuter/add-support-for-qemu-builds

Add support for running builds within an QEMU emulation

hack/make/.detect-daemon-osarch

@@ -19,7 +19,7 @@ docker-version-osarch() {
 }
 
 # Retrieve OS/ARCH of docker daemon, e.g. linux/amd64
-export DOCKER_ENGINE_OSARCH="$(docker-version-osarch 'Server')"
+export DOCKER_ENGINE_OSARCH="${DOCKER_ENGINE_OSARCH:=$(docker-version-osarch 'Server')}"
 export DOCKER_ENGINE_GOOS="${DOCKER_ENGINE_OSARCH%/*}"
 export DOCKER_ENGINE_GOARCH="${DOCKER_ENGINE_OSARCH##*/}"
 DOCKER_ENGINE_GOARCH=${DOCKER_ENGINE_GOARCH:=amd64}