software/slaprunner: run supervisord with explicit slapos.cfg argument

~/bin/slapos script does not overwrite $SLAPOS_CONFIGURATION if it's set,
to prevent service accidentally use another slapos.cfg if $SLAPOS_CONFIGURATION
is set for some reason, explicit pass the path of the slapos.cfg
4 jobs for fix/slaprunner-promise in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-Python3

03:21:11

failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-WIP

10:09:33

failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-Python3

03:43:06

canceled SlapOS.SoftwareReleases.IntegrationTest-Jerome-Python3