Add resource limits to all overlays with CI enforcement and documentation #43

Job	Run time
Discover overlays	4s
Verify documented resources	19s
Lint YAML files	18s
Lint shell scripts	6s
Verify resource limits (metrics)	15s
Verify resource limits (core)	18s
Validate Kustomize (core/stack)	5s
Validate Kustomize (metrics/stack)	7s
Validate Kustomize (core/base)	11s
Validate Kustomize (metrics/base)	16s
	1m 59s

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