Install packages in Jenkins slave container to execute stages in container.

Dockerfile

FROM jenkins/slave
# File Author / Maintainer
MAINTAINER Vijay Daswani

ENV KUBECTL_VERSION=v1.18.0

USER root

RUN apt-get update -y
RUN apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common -y
RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -

RUN apt install docker.io -y

# Install kubectl
RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl \
  && chmod +x ./kubectl \
  && mv ./kubectl /usr/local/bin/kubectl
COPY config /home/jenkins/.kube/config
COPY jenkins-agent /usr/local/bin/jenkins-agent
RUN chmod +x /usr/local/bin/jenkins-agent &&\
    ln -s /usr/local/bin/jenkins-agent /usr/local/bin/jenkins-slave
USER jenkins
ENTRYPOINT ["jenkins-agent"]