Remove erroneous -O flag for curl

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:3.4
 RUN apk --no-cache add curl ca-certificates bash
-RUN curl -o /usr/local/bin/kubectl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
+RUN curl -Lo /usr/local/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
 RUN chmod +x /usr/local/bin/kubectl
 COPY update.sh /bin/
 ENTRYPOINT ["/bin/bash"]

update.sh

@@ -28,6 +28,7 @@ fi
 kubectl config set-context default --cluster=default --user=default
 kubectl config use-context default
 
+# kubectl version
 IFS=',' read -r -a DEPLOYMENTS <<< "$PLUGIN_DEPLOYMENT"
 for DEPLOY in ${DEPLOYMENTS[@]}; do
   echo Deploying to $KUBERNETES_SERVER