minor change - dockerfile to get var value

Author: Shekharrajak

Dockerfile

@@ -13,6 +13,7 @@ RUN chmod +x .scripts/deploy.sh
 RUN .scripts/install.sh
 RUN .scripts/build.sh
 
-RUN IFS='/' read -r -a array <<< "$REF" && export PR_NUMBER=array[2]
+RUN echo $REF;
+RUN export PR_NUMBER=$(echo $REF | cut -d'/' -f3);echo $PR_NUMBER;
 
 ENTRYPOINT .scripts/deploy.sh; /bin/bash