asterus: add cluster entry point

Flux self-managed bootstrap files copied from ugok (controller images
already mirrored to cr.yandex), GitRepository/Kustomization pointed at
gitlab.sarex.io directly since the cluster has outbound internet access.
Starts with just flux-system + helm-repositories, infra/apps to be added
incrementally.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

clusters/asterus/flux-system/gotk-sync.yaml

@@ -0,0 +1,25 @@
+apiVersion: source.toolkit.fluxcd.io/v1
+kind: GitRepository
+metadata:
+  name: flux-system
+  namespace: flux-system
+spec:
+  interval: 1m0s
+  ref:
+    branch: master
+  url: https://gitlab.sarex.io/infra/iac.git
+  secretRef:
+    name: flux-system
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: flux-system
+  namespace: flux-system
+spec:
+  interval: 10m0s
+  path: ./clusters/asterus
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    name: flux-system

clusters/asterus/flux-system/kustomization.yaml

@@ -0,0 +1,5 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- gotk-components.yaml
+- gotk-sync.yaml

clusters/asterus/helm-repositories.yaml

@@ -0,0 +1,12 @@
+---
+apiVersion: source.toolkit.fluxcd.io/v1
+kind: HelmRepository
+metadata:
+  name: yc-oci-charts
+  namespace: flux-system
+spec:
+  type: oci
+  interval: 10m0s
+  url: oci://cr.yandex/crp3ccidau046kdj8g9q/charts
+  secretRef:
+    name: yc-cr-auth

clusters/asterus/kustomization.yaml

@@ -0,0 +1,5 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ./flux-system
+  - ./helm-repositories.yaml