change volume string

Author: Phil Varner

.github/workflows/cicd.yml

@@ -20,7 +20,7 @@ jobs:
         env:
           ES_JAVA_OPTS: -Xms512m -Xmx1g
         volumes:
-          - "${GITHUB_WORKSPACE}/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml"
+          - $GITHUB_WORKSPACE/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
         ports:
           - 9200:9200