Add chia-db-pull init container feature for ChiaNodes

[Starttoaster]

Note

Medium Risk
Adds new CRD surface area and changes ChiaNode reconciliation to inject and validate an init container, which can block node rollout if misconfigured. Limited security impact, but touches core controller behavior and manifests.

Overview
Adds first-class spec.chiaDBPull support to ChiaNode, enabling an optional chia-db-pull init container that preloads the blockchain DB from an S3-compatible bucket into CHIA_ROOT before the main container starts.

The controller now validates chiaDBPull.s3Prefix when enabled, appends the init container after any user-provided spec.initContainers, and derives the NETWORK env from spec.chiaDBPull.network or the surrounding chia network config.

Plumbs a default chia-db-pull image/tag through build tooling (build.yml, Dockerfile, Makefile ldflags), updates CRD/schema + generated deep-copies, and adds unit/integration tests plus documentation for the new config.

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