remove sudo package, update kubectl version

Author: drewkit

deployment/Dockerfile

@@ -6,11 +6,10 @@ RUN \
     bash \
     curl \
     jq \
-    zip \
-    sudo
+    zip
 
 # https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl-binary-via-curl
-ARG KUBECTL_VERSION="v1.8.5"
+ARG KUBECTL_VERSION="v1.9.0"
 RUN curl -L "https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl" > /usr/local/bin/kubectl \
     && chmod +x /usr/local/bin/kubectl