Support darwin arm64 binary [CI SKIP]

Dockerfile.dapper

@@ -19,7 +19,7 @@ ENV DOCKER_URL_amd64=https://get.docker.com/builds/Linux/x86_64/docker-1.10.3 \
     DOCKER_URL=DOCKER_URL_${ARCH}
 RUN wget -O - ${!DOCKER_URL} > /usr/bin/docker && chmod +x /usr/bin/docker
 
-ENV GIT_COMMIT="591cb7816f12c4936f355666fc8bf9b9f63fa806" \
+ENV GIT_COMMIT="d493afc3dbf4dd5f118fd069e5244caeaaecd6fb" \
     GIT_BRANCH="ke/v0.2" \
     GIT_SOURCE="/go/src/github.com/rancher/steve" \
     CATTLE_DASHBOARD_UI_VERSION="v2.6.7-rc5-kube-explorer-ui-rc2"

scripts/build

@@ -4,7 +4,7 @@ set -e
 source $(dirname $0)/version
 
 OS_ARCH_ARG_LINUX="amd64 arm arm64"
-OS_ARCH_ARG_DARWIN="amd64"
+OS_ARCH_ARG_DARWIN="amd64 arm64"
 
 LD_INJECT_VALUES="-X github.com/rancher/steve/pkg/version.Version=$VERSION
                   -X github.com/rancher/steve/pkg/version.GitCommit=$COMMIT"
@@ -40,7 +40,9 @@ else
 fi
 
 for f in $(ls ./bin/); do
-    upx -o $DAPPER_SOURCE/bin/$f bin/$f || true
+    if [[ $f != *darwin-arm64 ]]; then
+        upx -o $DAPPER_SOURCE/bin/$f bin/$f || true
+    fi
     if [ -f $DAPPER_SOURCE/bin/$f ]; then
         echo "UPX done!"
     else