Add intructions for debugging (#154)

action/entrypoint.sh

@@ -8,6 +8,23 @@ source /steps/activate.sh
 source /steps/build.sh
 source /steps/return_license.sh
 
+#
+# Instructions for debugging
+#
+
+if [[ $BUILD_EXIT_CODE -gt 0 ]]; then
+echo ""
+echo "###########################"
+echo "#         Failure         #"
+echo "###########################"
+echo ""
+echo "Please note that the exit code is not very descriptive."
+echo "Most likely it will not help you solve the issue."
+echo ""
+echo "To find the reason for failure: please search for errors in the log above."
+echo ""
+fi;
+
 #
 # Exit with code from the build step.
 #