Deploy react to server with gitlab

.gitlab-ci.yml

build site:
  image: node:12.13.0-slim
  stage: build
  before_script:
    - curl -o- -L https://yarnpkg.com/install.sh | bash
    - export PATH="$HOME/.yarn/bin:$HOME/.config/yarn/global/node_modules/.bin:$PATH"
    - yarn install --pure-lockfile --cache-folder .yarn
  cache:
    paths:
      - node_modules/
      - .yarn

  script:
    - yarn build
  artifacts:
    expire_in: 1 week
    paths:
      - build

deploy:
  image: alpine
  stage: deploy
  script:
    - apk add --no-cache rsync openssh
    - mkdir -p ~/.ssh
    - echo "$SSH_PRIVATE_KEY" >> ~/.ssh/id_rsa
    - chmod 600 ~/.ssh/id_rsa
    - echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config
    - rsync -rav --delete build/ user@server.com:/your/project/path/