Ensure jenkins user has permission to access docker daemon socket

dockergrp.sh

#!/bin/bash

if [ -e /var/run/docker.sock ]; then
  DOCKER_GID=$(stat -c '%g' /var/run/docker.sock)
else
  exit 0
fi

if [ ${DOCKER_GID} ]; then
  DOCKER_GROUP=$(getent group ${DOCKER_GID} | cut -d: -f1)
fi

if [ ! ${DOCKER_GROUP} ]; then
  DOCKER_GROUP=hdocker
  sudo groupadd -for -g ${DOCKER_GID} ${DOCKER_GROUP}
fi

sudo usermod -aG ${DOCKER_GROUP} jenkins