get-saggar(kube): deploy

The saggar-dist chart: a single-node Garage hosting the distribution
bucket — public read-only website on get.saggar.dev (the host label
is what Garage's vhost routing resolves the bucket from), S3 write
surface staying cluster-internal for the publish workflow. Same edge
path as the other saggar hosts: dns A record, cert-manager
certificate, caddy route. Chart repo and packages auth carry over
from the saggar release.

kubernetes/kustomization.yaml

@@ -47,6 +47,7 @@ resources:
   # Production (public-facing websites/apps)
   - production/buildpath
   - production/saggar
+  - production/get-saggar
   - production/semery-fr
   - production/umami
   - production/vhaudiquet-fr