🏃 fix gsutil push issue

Author: Mengqi Yu

build/cloudbuild_snapshot.yaml

@@ -36,6 +36,6 @@ steps:
   env:
    - 'KUBERNETES_VERSION=1.13.1'
 - name: 'gcr.io/cloud-builders/gsutil'
-  args: ['-h', 'Content-Type:application/gzip', 'cp', '-a', 'public-read', 'dist/kubebuilder_master_linux_amd64.tar.gz', 'gs://kubebuilder-release/kubebuilder_master_linux_amd64.tar.gz']
+  args: ['-h', 'Content-Type:application/gzip', 'cp', 'dist/kubebuilder_master_linux_amd64.tar.gz', 'gs://kubebuilder-release/kubebuilder_master_linux_amd64.tar.gz']
 - name: 'gcr.io/cloud-builders/gsutil'
-  args: ['-h', 'Content-Type:application/gzip', 'cp', '-a', 'public-read', 'dist/kubebuilder_master_darwin_amd64.tar.gz', 'gs://kubebuilder-release/kubebuilder_master_darwin_amd64.tar.gz']
+  args: ['-h', 'Content-Type:application/gzip', 'cp', 'dist/kubebuilder_master_darwin_amd64.tar.gz', 'gs://kubebuilder-release/kubebuilder_master_darwin_amd64.tar.gz']