Update runner tags to restrict to a particular branch

.gitlab-ci.yml

@@ -55,7 +55,8 @@ nextflow_test_docker:
   artifacts:
     paths:
     - $CI_PROJECT_DIR/workflow/.nextflow.log
-
+  tags:
+    - cluster_node
 
 nextflow_test_singularity:
   stage: test
@@ -67,7 +68,8 @@ nextflow_test_singularity:
   artifacts:
     paths:
     - $CI_PROJECT_DIR/workflow/.nextflow.log
-
+  tags:
+    - cluster_node
 
 
 # This runs the workflow with test data and does a simple
@@ -90,7 +92,9 @@ docker_astrocyte_test:
   - echo "Run astrocyte using dockerhub/docker.io registry pulls"
   - astrocyte_cli run "$CI_PROJECT_DIR" --option=q
   - test -s "$CI_PROJECT_DIR/workflow/output/mobydick.txt.uppercase.tolines.wordcount"
- 
+  tags:
+    - cluster_node
+
 cache_docker_image:
   stage: cache_docker
   script: