Update .gitlab-ci.yml

.gitlab-ci.yml

-job1:
+stages:
+  - build 
+  - test
+  - deploy
+  
+build-job:
+  stage: build
   script:
-   - echo "hello world"
+    - echo "complinoing the code"
+    - mkdir build/
+    - echo "my app binary file" > build/executable-binary-file-v1
+    
+unit-test-job:
   stage: test
-  tags:
-   - ci
+  script:
+    - echo "running unit test job"
+    - cat $CI_PROJECT_DIR/build/executable-binary-file-v1
+    
+lint-test-job:
+  stage: test
+  script:
+    - echo "linting code "
+    
+deploy-job:
+  stage: deploy
+  script:
+    - echo "deploying"
+