Update .gitlab-ci.yml file

.gitlab-ci.yml

+stages:
+  - test
+  - deploy
+
+variables:
+  NODE_IMAGE: "node:14"
+
+before_script:
+  - npm install
+
+test:
+  stage: test
+  script:
+    - npm test
+
+deploy:
+  stage: deploy
+  only:
+    - master
+  script:
+    - npm install --production
+    - echo "Deploy to production..."
+    # Add your deployment commands here