I followed this tutorial : https://cloud.google.com/solutions/configuring-jenkins-container-engine

But when my job run, I got

kubectl: not found

My slave are running

Running on jnlp-slave-d8faf62bf22c in /home/jenkins/workspace/k8s_symfony_master-HZ7SATWV7476573CS6I3WV3262VOLZDL4KE2TDMAG4ILA4UCBMWQ

My slave dockerfile :

FROM jenkinsci/jnlp-slave
MAINTAINER Vic Iglesias <viglesias@google.com>
ENV CLOUDSDK_CORE_DISABLE_PROMPTS 1
ENV PATH /opt/google-cloud-sdk/bin:$PATH
USER root
RUN apt-get update -y
RUN apt-get install -y jq
RUN curl https://sdk.cloud.google.com | bash && mv google-cloud-sdk /opt
RUN gcloud components install kubectl

And my config jenkins :