fix: keep directory when entering container

enter.sh

@@ -45,14 +45,14 @@ run_args() {
   arg "-v $name:/home/user:copy"
 
   # Add custom user configuration.
-  config_file="./containers/$name/config.sh"
+  config_file="$script_dir/containers/$name/config.sh"
   [ -f "${config_file}" ] && source "${config_file}"
 }
 
 ### MAIN ###
-cd "$(dirname "$(realpath "$0")")"
-name=$(<"./state/last-name")
-registry=$(<"./state/registry")
+script_dir="$(dirname "$(realpath "$0")")"
+name=$(<"$script_dir/state/last-name")
+registry=$(<"$script_dir/state/registry")
 pull=false
 
 while test $# -gt 0; do
@@ -61,7 +61,7 @@ while test $# -gt 0; do
   -*) log "unknown argument '$1'" 'x' 31 ;;
   *)
     name="$1"
-    echo "$1" >"./state/last-name"
+    echo "$1" >"$script_dir/state/last-name"
     ;;
   esac
   shift