CI CD ionic Project . Configuring gitlab-ci.yml?

Question

I want to configure a gitlab-ci.yml file for an ionic projects and still confusing .

• what's the main stages for every projects for the CI CD configuration?
• difference between the build and the deploy stages?
• how can implement a build stage for ionic project?

this is my try for the gitlab-ci.yml in my project:

stages:
  - test
  - deploy

build_web:
  image: node:latest
  stage: test 
  only:
      - main
  script:
    - npm install
    - npm run lint
    - npm run test
    - npm run build
    - npm run e2e
    - npm run deploy

build_ios:
  stage: deploy
  only:
    - release 
  script:
    - ./ionic-login.sh
    - ls
    - npm run ios:release:ci
    - ./ionic-package-ios.sh

build_android:
  stage: deploy
  only:
    - release
  script:
    - ls
    - npm run android:release
    - ls ./platforms/android/build/outputs/apk/android*.apk
  artifacts:
    paths:
      - platforms/android/build/outputs/apk/
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