Install docker inside code-server container

install-docker-in-code-server.sh

# see more at: https://docs.docker.com/engine/install/ubuntu/
apt-get update
apt-get install ca-certificates curl gnupg lsb-release
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
apt-get update
apt-get install docker-ce docker-ce-cli containerd.io
# see more at: https://docs.docker.com/engine/install/linux-postinstall/
groupdel docker
dockergroup=$(ls -l /var/run/docker.sock | awk '{print $4}')
re='^[0-9]+$'
if ! [[ $dockergroup =~ $re ]] ; then
    groupadd $dockergroup
else
    groupadd -g $dockergroup docker
fi
# abc is a default user in code-server container
usermod -aG $dockergroup abc
newgrp docker