Postgres app I'm attempting to reduce the amount of steps in getting my app to the cloud and potentially moving it around various cloud service

I'm attempting to reduce the amount of steps in getting my app to the cloud and potentially moving it around various cloud service providers as I try them out. Containerization appears to be the central principle here, but I need some advice on best practices:

I've got a webapp that I'm serving on localhost using Flask and mod-wsgi-express. The pages use AngularJS routes and ajax to retrieve statistics from a PostgreSQL database and graph them using D3.

I'm preparing to move this app to my Google Cloud account where Postgres is already running, then utilize Kubernetes to run a few of the modules as services. What I'm unclear on is:

Should I be Kubernetes-izing my app ON my machine while I finalize the development, using something like minikube? If so, why?
Once my app is in the cloud running on Kubernetes, is it possible to then Docker-ize this and eventually move it to another cloud hosting provider (which may not support Kubernetes) in the future like AWS? Or must it be Docker-ized first? or as a parallel project to getting the app into Google Cloud?

Google Cloud allows you to setup Virtual Machines with CentOS/Apache, etc. So I know the webapp can run there, I just don't want to get trapped in using Google Cloud forever in case another service comes along with better tools.

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