refactor(coredns): replace pod-based deployment with in-process library

[stevensbkang]

No description provided.

[linear]

KS-46 Refactor CoreDNS for stablisation

[Copilot]

Pull request overview

This PR refactors CoreDNS from a pod-based Kubernetes deployment (image import + Deployment/ServiceAccount/RBAC) to an in-process CoreDNS library started directly by kubesolo, while removing the now-unused embedded CoreDNS image artifacts.

Changes:

• Remove embedded CoreDNS image + containerd import path and related type/constants.
• Add an in-process CoreDNS service that starts in forward-only mode, then hot-reloads to a cluster-aware config after the API server is ready.
• Register a selectorless kube-dns Service and a manually managed EndpointSlice to route ClusterIP:53 to the node-bound CoreDNS port.

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
types/types.go	Removes embedded CoreDNS image path field.
types/const.go	Removes default CoreDNS image constant.
pkg/runtime/containerd/service.go	Drops CoreDNS image path wiring from containerd runtime service.
pkg/runtime/containerd/image.go	Stops importing the CoreDNS image into containerd.
pkg/kubernetes/kubelet/health.go	Reworks kubelet health check into a polling loop with a longer timeout.
pkg/kine/config.go	Adjusts SQLite DSN parameters for kine.
pkg/components/coredns/service.go	Creates selectorless kube-dns Service and a manual EndpointSlice for in-process CoreDNS.
pkg/components/coredns/server.go	New: runs CoreDNS in-process and hot-reloads config after API server readiness.
pkg/components/coredns/configuration.go	Replaces ConfigMap-based Corefile with in-process Corefile generators.
pkg/components/coredns/cleanup.go	New: removes legacy pod-based CoreDNS resources.
pkg/components/coredns/rbac.go	Removed: no longer needed for pod-based CoreDNS.
pkg/components/coredns/deployment.go	Removed: no longer deploying CoreDNS as a Deployment.
pkg/components/coredns/coredns.go	Removed: old deploy/wait logic for pod-based CoreDNS.
internal/core/embedded/load.go	Removes CoreDNS image from embedded image extraction list.
internal/core/embedded/embedded.go	Stops embedding bin/images/coredns.tar.gz.
internal/core/embedded/embedded_riscv64.go	Stops embedding bin/images/coredns.tar.gz on riscv64 too.
cmd/kubesolo/main.go	Starts CoreDNS as a first-class service in the startup sequence instead of deploying it afterward.
go.mod	Adds CoreDNS library deps and updates/locks some dependency versions.
go.sum	Updates module checksums for the dependency graph changes.

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