fix: add cross build in build script and docker

package/Dockerfile

@@ -1,12 +1,14 @@
 FROM registry.suse.com/bci/bci-base:15.5
+ARG TARGETPLATFORM
+ENV TARGETPATH=${TARGETPLATFORM:-"."}
 RUN zypper -n update && \
     zypper -n clean -a && \
     rm -rf /tmp/* /var/tmp/* /usr/share/doc/packages/*
 RUN useradd --uid 1007 tke-operator
 ENV KUBECONFIG /home/tke-operator/.kube/config
 ENV SSL_CERT_DIR /etc/rancher/ssl
 
-COPY bin/tke-operator /usr/bin/
+COPY bin/${TARGETPATH}/tke-operator /usr/bin/
 COPY package/entrypoint.sh /usr/bin
 RUN chmod +x /usr/bin/entrypoint.sh
 

scripts/build

@@ -8,4 +8,16 @@ mkdir -p bin
 if [ "$(uname)" = "Linux" ]; then
     OTHER_LINKFLAGS="-extldflags -static -s"
 fi
-CGO_ENABLED=0 go build -ldflags "$OTHER_LINKFLAGS" -o bin/tke-operator
+CGO_ENABLED=0 go build -ldflags "$OTHER_LINKFLAGS" -o bin/tke-operator
+
+if [ -n "$CROSS" ]; then
+    for platform in linux/amd64 linux/arm64; do
+        os="${platform%/*}"
+        arch="${platform#*/}"
+        FLAGS="$LINKFLAGS"
+        [ "$os" = "linux" ] && FLAGS="-extldflags -static -s $FLAGS"
+        echo "building $os $arch binary"
+        mkdir -p bin/$os/$arch
+        GOOS=$os GOARCH=$arch go build -ldflags "$FLAGS" -o bin/$os/$arch/tke-operator
+    done
+fi