minor change - dockerfile to get var value

Author: Shekharrajak

Dockerfile

@@ -13,7 +13,9 @@ RUN chmod +x .scripts/deploy.sh
 RUN .scripts/install.sh
 RUN .scripts/build.sh
 
-RUN echo $REF;
+RUN echo ${REF}
+RUN echo "$REF"
+RUN echo ${{REF}};
 RUN export PR_NUMBER=$(echo $REF | cut -d'/' -f3);echo $PR_NUMBER;
 
 ENTRYPOINT .scripts/deploy.sh; /bin/bash