Simplify expression

Author: bgandon

Dockerfile

@@ -19,7 +19,7 @@ COPY check /opt/resource/check
 COPY in    /opt/resource/in
 COPY out   /opt/resource/out
 
-RUN chmod +x /opt/resource/out /opt/resource/in /opt/resource/check
+RUN chmod +x /opt/resource/{check,in,out}
 
 ADD test/ /opt/resource-tests/
 RUN /opt/resource-tests/all.sh \