A3 integration: infrastructure and deploy

[elsand]

Introduction

The PoC (and later full implementation) for the Altinn 3 storage integration (see #1138) needs somewhere to be deployed

Description

Storage and the other applications owned by team core is running in the central platform AKS cluster. We need to write IAC as well as a build and deploy pipeline for this.

Implementation

Tasks

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1. Request set up of AKS for the dialogporten-adapter workload from team platform, in coordination with team core
2. Establish Github build and deploy pipeline, similar to those already set up for storage, events, notificaiton