container: lib_taxes: optimize writes by forking

- Decreases real time in multicore container environments.
  * Given the nature of the writer, there should be no race conditions.

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

@@ -1036,6 +1036,7 @@ function lib_taxes::__taxes_write()
     # Generate transparent (full) reports
     local _ext_full="report_full.csv"
     for _arg_tag in "${global_arg_tag[@]}"; do
+    (
       lib_utils::print_custom "    \e[32m├─\e[34m\e[1;3m ${_arg_tag} (full)\e[0m\n"
 
       local _base_path="${_tax_root_dir}/${_arg_tag}/${_tax_year}_${_arg_tag}"
@@ -1047,7 +1048,9 @@ function lib_taxes::__taxes_write()
       if [[ ! -f "$_out_file" || ! -s "$_out_file" ]]; then
         lib_utils::print_warning "Nothing generated for '${_arg_tag}' (no taxable event found for the year ${global_arg_year})"
       fi
+    ) &
     done
+    wait
 
     # Patch transparent (full) reports
     # WARNING: depends on previous base path / extension format # TODO: no, not this way