Support colmena eval --raw

[srid]

❯ colmena eval -E '{ nodes, ... }: let cfg = nodes.fpindia-chat.config.deployment; in "${cfg.targetUser}@${cfg.targetHost}"'
[INFO ] Using flake: git+file:///Users/srid/code/fpindia-chat
"admin@165.22.214.173"

A --raw that removes those wrapping quotes in the output would be nice.

This would allow me to remove the tr -d '"' in the following script (used, incidentally, to ssh to the remote node):

pkgs.writeShellScriptBin "ssh-to-remote"
  ''
    ADDR=''$(${lib.getExe pkgs.colmena} eval -E '{ nodes, ... }:
        let cfg = nodes.myserver.config.deployment;
        in "''${cfg.targetUser}@''${cfg.targetHost}"' | tr -d '"'
    )
    set -x
    ssh $ADDR
  '';

Real-world usage: fpindia/fpindia-chat@1e3fc47