SPIKE: Get ADF pipeline working with a K8s-deployed building block

[emmastephenson]

Action Requested

Once we have one of our building blocks successfully running on Kubernetes, the next step is to determine how to integrate that Kubernetes-deployed building block into the existing pipeline.

The action requested for this spike is to attempt to get the Kubernetes-deployed building block (likely either validation or FHIR Conversion) used as a drop-in replacement for the existing building block in the ADF pipeline.

Acceptance Criteria

This is complete when a Kubernetes-deployed building block is receiving pipeline traffic in a Skylight test environment.

The request here is NOT to get this working in a production-ready way (e.g., no Terraform or PR reviews required). It's simply a proof-of-concept to see how difficult it is to replace an Azure Container Application with a Kubernetes container in the pipeline.

Background & Context

This work will help us determine the level of difficulty in migrating our building blocks to K8s. It will be used to inform #679.

[emmastephenson]

Tested 7/7 and this is working with some of the building blocks! FHIR conversion, validation, and ingestion are all partially working in ADF running on K8s. Environment variables are not set up yet, so some endpoints (notably geocoding) are not working yet.