Fix for multigpu runs with docker executor

[Kipok]

Without this change I get

nemo-run-0/0 --------------------------------------------------------------------------                                                                                                                           
nemo-run-0/0 While trying to create a regular expression of the node names                                                                                                                                        
nemo-run-0/0 used in this application, the regex parser has detected the                                                                                                                                          
nemo-run-0/0 presence of an illegal character in the following node name:                                                                                                                                         
nemo-run-0/0
nemo-run-0/0   node:  eval_1736300653_nemo-run-0
nemo-run-0/0
nemo-run-0/0 Node names must be composed of a combination of ascii letters,
nemo-run-0/0 digits, dots, and the hyphen ('-') character. See the following
nemo-run-0/0 for an explanation:
nemo-run-0/0
nemo-run-0/0   https://en.wikipedia.org/wiki/Hostname
nemo-run-0/0
nemo-run-0/0 Please correct the error and try again.
nemo-run-0/0 --------------------------------------------------------------------------
nemo-run-0/0 --------------------------------------------------------------------------
nemo-run-0/0 An internal error has occurred in ORTE:
nemo-run-0/0
nemo-run-0/0 [[41165,0],0] FORCE-TERMINATE AT (null):1 - error ../../../../../orte/mca/plm/base/plm_base_launch_support.c(555)
nemo-run-0/0
nemo-run-0/0 This is something that should be reported to the developers.
nemo-run-0/0 --------------------------------------------------------------------------