client: docker: lib_plugins: allow path depth

- Allows plugins to function within subdirectories
- Removes redundant arg checking

client/src/docker/lib/internal/lib_plugins.bash

@@ -88,13 +88,11 @@ function lib_plugins::__parse_args()
 
   [[ ! "$_arg" =~ (^repo${global_arg_delim_1}|^custom${global_arg_delim_1}) ]] && lib_utils::die_usage "$_usage"
 
-  local -r _key="${_arg%${global_arg_delim_1}*}"
+  local -r _key="${_arg%%${global_arg_delim_1}*}"
   local -r _len="$((${#_key} + 1))"
 
-  if [[ "$_key" =~ ^repo$|^custom$ ]]; then
   local -r _arg_type="${_arg:${_len}}"
   [ -z "$_arg_type" ] && lib_utils::die_usage "$_usage"
-  fi
 
   local _path
   case "$_key" in