AUTOMATE DRUPAL 8 DEPLOYMENT PROCESS

I will try to explain how we can automate our deployments process by using common tools:

Git: for versioning your code and YAML for configuration files of your settings
Drush: to run import or export configuration for deployment. additionally clear cache or update database.
Composer: all your site dependencies can be managed like modules, libraries, core or even getting newer version.
Jenkins: you can setup jobs that can automate the process.