modification and validation yml file

.gitlab-ci - Copy_Back_UP.yml

+demo_job_CICD_project:
+     tags:
+       - ci
+     script:
+       - echo Hello World CICD Test
\ No newline at end of file

.gitlab-ci.yml

 demo_job_CICD_project:
-     
-    
-build:
-  stage: build
-  script:
-   - "mvn clean install -Dmaven.test.skip=true"
-  artifacts:
-    expire_in: 1 week
-    when: on_success
-    paths:
-    - target/*.jar
\ No newline at end of file
+    stage: build
+    script:
+    - "mvn clean install -Dmaven.test.skip=true"
+    artifacts:
+    when: on_success
\ No newline at end of file