Gitlab + Kubernetes. Is it possible to deploy multiple instances of the same application with different configs?

Question

Software Deployment

There is an application in PHP. It is necessary to deploy/maintain many instances of this application, each client has its own instance. Instances will differ only in configuration files.
GitLab and Kubernetes are supposed to be used.
How can you organize the creation of a new application instance for a new client? And further update of all instances.

Answer 1

https://docs.gitlab.com/ee/topics/autodevops/index.html