update gitlab ci

.gitlab-ci.yml

 stages:
   - validate
-  - build
-  - deploy
 validate:
   stage: validate
-  script:
-    - ./script/validate.sh
-  tags:
-    - fresh-eton
-  except:
-    - tags
-build:
-  stage: build
   before_script:
-    - echo "Pipline CICD for dev branch" 
-    - export GITLAB_ORIGINAL_DIR=$CI_PROJECT_DIR
+    - export KUBECONFIG=/home/gitlab-runner/k8s-training.yaml
   script:
-    - sudo -E /root/userpnhat/lab1/script/build-devbranch.sh
-  tags:
-    - fresh-eton
-  except:
-    - tags
-deploy:
-  stage: deploy
-  script:
-    - sudo /root/userpnhat/lab1/script/deploy-devbranch.sh
+    - ./script/validate.sh
   tags:
     - fresh-eton
   except: