Update .gitlab-ci.yml following task 2 step 2

.gitlab-ci.yml

@@ -4,14 +4,18 @@ stages:
 
 job1:
     stage: generate
+    artifacts:
+        paths:
+            - build/
     script:
-        - mkdir build
         - echo "Hello I am job 1" > build/job1-result.txt
 
 job2:
     stage: generate
+    artifacts:
+        paths:
+            - build/
     script:
-        - mkdir build
         - echo "Hello I am job 2" > build/job2-result.txt
 
 job3: