Complete local Minikube/Triton/LocalStack scaffolding for end-to-end S3 model deployment testing

[Copilot]

Local testing scaffolding existed but was incomplete for exercising the operator end-to-end with S3-backed model loading. This PR wires Minikube, Triton, and LocalStack into a single runnable flow and aligns local manifests with the operator’s actual S3 contract.

• Orchestrated local E2E workflow

  • Extended kube:develop to start LocalStack, wait for S3 readiness, deploy Triton/operator, and apply S3 example resources.
  • Extended kube:stop-develop to delete example resources and tear down LocalStack cleanly.
  • Added explicit tasks: start-localstack, wait-localstack, stop-localstack, apply-s3-example, delete-s3-example.

• Hardened LocalStack bootstrap

  • Updated docker-compose.yaml to use LocalStack edge port 4566 and pinned image version for reproducible local behavior.
  • Improved S3 init script to be idempotent via head-bucket existence check before bucket creation.
  • Seeds the expected model artifact at s3://bucket/model_repository/model.graphdef.

• Aligned example manifests with runtime expectations

  • Updated example/config-map-operator.yaml to the keys consumed by renderer args:
    • aws_access_key_id
    • aws_secret_access_key
    • aws_region_name
    • aws_endpoint_url
  • Set namespace-scoped local config (triton) and explicit local-only dummy credentials.
  • Corrected example/md-source-s3.yaml job template/auth wiring and model file metadata to match local seeded artifact and schema-valid values.

• Documented the intended local path

  • Added a focused README section for running/stopping full local E2E testing with:
    • task kube:develop
    • task kube:stop-develop

# example/config-map-operator.yaml
data:
  aws_access_key_id: LOCALSTACK_DUMMY_KEY
  aws_secret_access_key: LOCALSTACK_DUMMY_SECRET
  aws_region_name: us-east-1
  aws_endpoint_url: http://host.minikube.internal:4566