fix auto flake update script

hosts/server10/microvm-staging.nix

@@ -6,6 +6,7 @@ let
   };
   realizeFlake = with pkgs; "${writeScriptBin "realize-flake" ''
     #! ${runtimeShell} -e
+    set -x
     NAME=$1
 
     if [ $NAME = "borken-data-hoarder" ]; then
@@ -24,8 +25,8 @@ let
     fi
 
     cd /tmp
-    if [ -d $DIR_DUMP_DVB ]; then
-       cd $DIR_NIX_CONFG
+    if [ -d $DIR_NIX_CONFIG ]; then
+       cd $DIR_NIX_CONFIG
        git fetch origin
        git reset --hard origin/$BRANCH
     else