v1alpha6 Design

[jeffmccune]

Design the new types for v1alpha6 learning from mistakes made in v1alpha5.

Mistakes:

• Lists are difficult to compose. Use structs instead.
• Generators, Transformers, Validators are concepts. Technically they're all Tasks in a data transformation pipeline.

Plan: From the perspective of an user, start with the Platform entrypoint and work down to components. The main design changes are:

1. Standardize on k8s style lowerSnakeCase for field names.
2. Replace lists with structs, e.g. Platform.spec.componets.
3. Deprecate BuildPlan, use a TaskSet instead.
4. Ensure TaskSets are composable into one big TaskSet for all platform components.
5. Execute the tasks in the big TaskSet using topological sort over the DAG with a high level of concurrency.

TODO:

• Define the v1alpha6 Platform schema.
• Define the v1alpha6 TaskSet schema.
• Migrate the author schemas to use a core.TaskSet
• Helm
• Kustomize
• Resources
• File
• Command