client/container: implement debug log-levels

DOCKER_FINANCE_DEBUG will now support the following:

0 = no debug output
1 = `print_debug` (bash/PHP)
2 = level 1 + `set -xv` (bash)

container/src/finance/lib/internal/lib_utils.bash

@@ -54,7 +54,7 @@ function lib_utils::print_fatal()
 function lib_utils::print_debug()
 {
   # shellcheck disable=SC2154
-  if [[ "$DOCKER_FINANCE_DEBUG" == true ]]; then
+  if [[ "$DOCKER_FINANCE_DEBUG" =~ ^1$|^2$ ]]; then
     local _debug="${BASH_SOURCE[1]##*/}:${BASH_LINENO[0]} -> ${FUNCNAME[1]}"
     lib_utils::__print "\e[33m" "[DEBUG] ${_debug} -> $*"
   else