feat(docs): KEP-2599: Decouple runtime lifecycle from TrainJobs to simplify updating runtimes #3993

Job	Run time
Build and Publish Images (mlx-runtime, cmd/runtimes/mlx/Dockerfile, linux/amd64)	14m 55s
Build and Publish Images (xgboost-runtime, cmd/runtimes/xgboost/Dockerfile, linux/amd64,linux/arm64)	13m 1s
Build and Publish Images (torchtune-trainer, cmd/trainers/torchtune/Dockerfile, linux/amd64,linux...	4m 57s
Build and Publish Images (model-initializer, cmd/initializers/model/Dockerfile, linux/amd64,linux...	2m 45s
Build and Publish Images (dataset-initializer, cmd/initializers/dataset/Dockerfile, linux/amd64,l...	2m 57s
Build and Publish Images (data-cache, cmd/data_cache/Dockerfile, linux/amd64,linux/arm64)	56m 31s
Build and Publish Images (deepspeed-runtime, cmd/runtimes/deepspeed/Dockerfile, linux/amd64,linux...	58m 7s
Build and Publish Images (trainer-controller-manager, cmd/trainer-controller-manager/Dockerfile, ...	9m 24s
	2h 42m 37s

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