post_install(){
  cat >> root/.ssh/authorized_keys <<EOF
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPOydCxv9/tAV7AdS2HsUIEu547Z5qUJnWYwiO7rI9YL markus@markus-pc
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJUTcUBb+55jRY9TkpLgm8K/8nJfEXyjEX8zljdCCRpi markus@markus-nb
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFo3dc6H1FtVuliB70QY21+7Hsuheqq5ldfgGWg+QLXJ root@ares
EOF
}

# post_update(){
#   sed --in-place \
#     --regexp-extended '/^ssh-ed25519 .* (markus@markus-pc|markus@markus-nb|root@ares)$/d' \
#     root/.ssh/authorized_keys

#   cat >> root/.ssh/authorized_keys <<EOF
# ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPOydCxv9/tAV7AdS2HsUIEu547Z5qUJnWYwiO7rI9YL markus@markus-pc
# ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJUTcUBb+55jRY9TkpLgm8K/8nJfEXyjEX8zljdCCRpi markus@markus-nb
# ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFo3dc6H1FtVuliB70QY21+7Hsuheqq5ldfgGWg+QLXJ root@ares
# EOF
# }

post_remove(){
  sed --in-place \
    --regexp-extended '/^ssh-ed25519 .* (markus@markus-pc|markus@markus-nb|root@ares)$/d' \
    root/.ssh/authorized_keys
}