feat(client): add default curses-based ssh-askpass

exprs/curses-ssh-askpass.nix

@@ -0,0 +1,15 @@
+{
+  lib,
+  pinentry-curses,
+  writeShellScript,
+}:
+writeShellScript "curses-ssh-askpass" ''
+  if [ -z ''${1+x} ]; then
+    prompt="GETPIN"
+  else
+    prompt="SETDESC $1\nGETPIN"
+  fi
+
+  pin=$(echo -e "$prompt" | ${lib.getExe pinentry-curses} -T /dev/pts/0 | grep D | tr -d '\n')
+  echo "''${pin:2}"
+''

exprs/overlay.nix

@@ -1,5 +1,6 @@
 inputs: final: prev: {
   idea-ultimate-fixed = prev.callPackage ./idea-fixed.nix { };
+  curses-ssh-askpass = prev.callPackage ./curses-ssh-askpass.nix { };
 
   vencord = prev.vencord.overrideAttrs (old: rec {
     version = "${old.version}+git.${inputs.vencord.shortRev}";