Fix restic cross platform compile

Signed-off-by: Ming <mqiu@vmware.com>

Dockerfile

@@ -43,8 +43,8 @@ ENV GOOS=${TARGETOS} \
     GOARM=${TARGETVARIANT}
 
 RUN mkdir -p /output/usr/bin && \
-    bash ./hack/build-restic.sh && \
     export GOARM=$( echo "${GOARM}" | cut -c2-) && \
+    bash ./hack/build-restic.sh && \
     go build -o /output/${BIN} \
     -ldflags "${LDFLAGS}" ${PKG}/cmd/${BIN}
 

hack/build-restic.sh

@@ -50,6 +50,6 @@ fi
 mkdir ${build_path}/restic
 git clone -b v${RESTIC_VERSION} https://github.com/restic/restic.git ${build_path}/restic
 pushd ${build_path}/restic
-go run build.go -o ${restic_bin}
+go run build.go --goos "${GOOS}" --goarch "${GOARCH}" --goarm "${GOARM}" -o ${restic_bin}
 chmod +x ${restic_bin}
 popd