The image is based on ubuntu:lunar, and the default shell is bash, it containes kubectl, curl, git, wget, vim, nslookup, telnet, ping, etc.
Quick access to isolated cli env to operate multiple clusters
cat >> ~/.zshrc <<EOF
alias cli="docker run -it --mount type=bind,source=${OPENRCS_DIR},target=/openrcs {CONTAINER_REPO?}:latest"
EOF