ci: set `automated_test` resource group to disable concurrency

.gitlab-ci.yml

@@ -72,6 +72,7 @@ automated_test:
     - echo "Given variables are REFERENCE=$REFERENCE, OUTPUT=$OUTPUT, DETECTORS=$DETECTORS, CALIBRATION=$CALIBRATION"
     - python3 -m pytest ./tests/test_reference_runs --color yes --verbose --release-test --reference-folder /gpfs/exfel/d/cal_tst/reference_folder --out-folder /gpfs/exfel/data/scratch/xcaltst/test/$OUTPUT  --detectors $DETECTORS --calibration $CALIBRATION
   timeout: 24 hours
+  resource_group: automated_test
 
 cython-editable-install-test:
   stage: test