Add GPU ugni testing on Cray XC (#24945)

This adds a nightly testing config for gpu testing using ugni comm layer
on xc

[Reviewed by @e-kayrakli ]

util/cron/test-gpu-xc-cuda.ugni.bash

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+#
+# Build Arkouda on a cray-xc with GPU locale model
+
+CWD=$(cd $(dirname ${BASH_SOURCE[0]}) ; pwd)
+
+source $CWD/common-native-gpu.bash
+
+# Setup for GPU:
+module load cudatoolkit
+export CHPL_TARGET_COMPILER=llvm
+export CHPL_LLVM=bundled
+export CHPL_TARGET_CPU=native
+export CHPL_LAUNCHER_CONSTRAINT=BW18
+export CHPL_LAUNCHER="slurm-srun"
+
+# setup for XC perf (ugni, gnu, 28-core broadwell)
+module unload $(module -t list 2>&1 | grep PrgEnv-)
+module load PrgEnv-gnu
+module unload $(module -t list 2>&1 | grep craype-hugepages)
+module load craype-hugepages16M
+module unload perftools-base
+module unload atp
+module load craype-x86-cascadelake
+
+
+export CHPL_NIGHTLY_TEST_CONFIG_NAME="gpu-xc-cuda.ugni"
+$CWD/nightly -cron ${nightly_args}