Add some bash completions even in a "screen"

Some commands will be easiest to use with bash completion

kubectl completion bash > /etc/bash_completion.d/kubectl
helm completion bash > /etc/bash_completion.d/helm
k3d completion bash > /etc/bash_completion.d/k3d

For screen add this .screenrc in root and packer users homedir

# Don't display the copyright page
startup_message off

# To enable bash completion
defshell -bash

# keep scrollback n lines
defscrollback 1000