Update .gitlab-ci.yml

.gitlab-ci.yml

 stages: 
+        - build
         - test
+        - delivery
 
 variables:
         HELLO_WORLD: "hello from pipeline"
@@ -8,3 +10,13 @@ simple-test:
         stage: test
         script: 
                 - echo $HELLO_WORLD && exit 0
+
+pipou: 
+        stage: build
+        script: 
+                - gcc -Wall -Wextra -Werror 
+
+papou:
+        stage: delivery
+        script:
+                - ./web_with_c