Add dedicated flux-tenants controller with label selector
--watch-label-selector=sharding.fluxcd.io/key=tenants to handle
tenant workloads separately from platform components.
Update all kubernetes app HelmReleases to:
- Use chartRef with ExternalArtifact instead of OCIRepository sourceRef
- Add sharding.fluxcd.io/key=tenants label
- Add cozystack.io/target-cluster-name label
Update fluxinstall to parse multiple YAML manifest files and
use flux service for storage-adv-addr.
Add cozystack-basics package for core tenant/namespace setup.
Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>