Containerize my app for DigitalOcean platform

have a Kotlin/Spring-Boot app that I need containerized and running in the cloud.
My current stack consists of:

Spring-Boot/Kotlin backend
NodeJs Server back-end
Angular front-end
I need to containerize these apps on Digital Ocean Kubernetes platform

Deliverables
working replication of existing application on DigitalOcean platform
walkthrough explaining the steps you took
code pushed to a branch on my repository via github