GitLab Continuous Delivery Pipeline -> Deployment to Webserver (SSH) (without Composer)

.gitlab-ci.yml

before_script:
  - apt-get update -yqq
  - apt-get install -yqq git
  - 'which ssh-agent || ( apt-get install -qq openssh-client )'
  - mkdir -p ~/.ssh
  - eval $(ssh-agent -s)
  - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
stages:
  - deploy
deploy:staging:
  stage: deploy
  environment:
    name: staging
    url: $QA_DOMAIN
  script:
    - echo "Deploy to staging (QA) server"
    - ssh-add <(echo "$QA_SSH_PRIVATE_KEY")
    - ssh $QA_SERVER_USER@$QA_SERVER_HOST "cd $QA_WEB_ROOT && git reset --hard && git checkout develop && git pull origin develop && exit"
  only:
    - develop
deploy:prod:
  stage: deploy
  environment:
    name: production
    url: $PROD_DOMAIN
  script:
    - echo "Deploy to production server"
    - ssh-add <(echo "$PROD_SSH_PRIVATE_KEY")
    - ssh $PROD_SERVER_USER@$PROD_SERVER_HOST "cd $PROD_WEB_ROOT && git reset --hard && git checkout master && git pull origin master && exit"
  only:
    - master