[mkmik]

Adds tests for everything k8s.libsonnet does, and fixes a bug in adopt that the new tests found.

Tests (tests/k8s_test.jsonnet)

• Every template (31): right apiVersion and kind, typeFor finds it, and only namespaced kinds get the shared namespace.
• typeFor falls back to the plain Object for unknown kinds and groups.
• Deployment, StatefulSet, DaemonSet and Job get the PodTemplateSpec overlays. ObjectTemplateMeta labels land on both the object and its pods.
• Named arrays: containers_, initContainers_, volumes_, env_, ports_, volumeMounts_, Service ports_.
• default-container: set for one main container plus sidecars; not set for two main containers or none.
• Arrays keyed by something other than name: volumeClaimTemplates_, endpoints_, podMetricsEndpoints_, selector_.matchExpressions_, VaultSecret secrets_.
• RBAC refs and defaults; the generic helpers (applyOverlayEach, deriveEach, asKeyedArray, asNamedArray, orray); mounted components getting the parent's k8s, envConf and conf; RootComponent.
• adopt: nested overlays, new containers after adopt, unknown kinds unchanged.

Bug fix (adoptNamedArray)

After adopt, an overlay on an array inside an array item was ignored:

k8s.adopt(objs)[0] { spec+: { containers_+: { c+: { env_+: { A+: { value: 'b' } } } } } }
// env A still had its upstream value

Each item was adopted again when the output was built, and its upstream env array won over the overlay. Items are now adopted once, when adopt runs, so later overlays apply on top. New containers added after adopt still get the Container template. examples/adopt.golden is unchanged.

just test passes.

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