improve gitlab ci file further.

2 jobs for master in 3 seconds (queued for 1 second)
Status Job ID Name Coverage
  Main
failed #18837
integration
local-nix-build

00:00:03

passed #18838
integration
repoquality

00:00:02

 
Name Stage Failure
failed
local-nix-build Main
HEAD is now at 4b68849 put nix build in string
From https://xgitlab.cels.anl.gov/argo/argotk
4b68849..b8de750 master -> origin/master
Checking out b8de7503 as master...
Skipping Git submodules setup
$ nix-build $ARGOPKGS -A argotk --argo argotk-src ./.
error: unrecognised flag '--argo'
Try 'nix-build --help' for more information.
ERROR: Job failed: exit status 1