Fix gitlab for ruby

Author: ggeorgakoudis

.gitlab/custom-jobs-and-variables.yml

@@ -14,7 +14,7 @@ variables:
 
 # Ruby
 # Arguments for top level allocation
-  RUBY_SHARED_ALLOC: "--mpi=none --exclusive --reservation=ci --time=20 --nodes=1"
+  RUBY_SHARED_ALLOC: "--exclusive --reservation=ci --time=20 --nodes=1"
 # Arguments for job level allocation
   RUBY_JOB_ALLOC: "--mpi=none --reservation=ci --nodes=1"
 # Add variables that should apply to all the jobs on a machine: