Consultancy: Gitlab CI/CD & Kuberentes

We have a Kubernetes cluster associated with our Gitlab project. We would like to setup a pipeline that builds our code in a docker container, pushes it to a registry and auto deploys it to a staging environment, with a manual step to deploy to production.

We have the build and push image part working, we need help with the deploy part.

We need to speak with a DevOps engineer for about an hour to figure out what we're missing.