list file not exist

.gitlab-ci.yml

@@ -28,7 +28,7 @@ build-job:       # This job runs in the build stage, which runs first.
     - build
   script:
     - echo "Test with command substitution"
-    - FILES=$(ls)
+    - FILES=$(ls file_not_exist.txt)
     - echo $FILES
     - echo "Compiling the code..."
     - echo "Compile complete."