[feature proposal] custom translation profiles or templates for CRDs

[astromechza]

Currently, score-k8s converts to the workload into either a Deployment or a Statefulset + a Service object. This behavior is hard coded.

However, some folks want to convert to ArgoCDRollouts, VMs, or other CRDs or inject specific translation logic that is not common to all score consumers.

We want to support these kinds of workloads in Score too through a "workload templates" concept.

This must be a template of some kind that can validate and convert the input workload. Validation is needed because while Score spec provides some base validations according to the Score spec, the particular CRD may enforce stricter requirements - for example, only 1 container allowed. Or, no ordered containers, or no memory limits higher than X.

While Go templates are possible here, it may be better to go for Kustomize, KCL, Rego, or something that understands the context better 🤔