consul: remove standalone k8s consul (#530)

The standalone k8s Consul runs its own raft under DC `au-syd1`, the same DC name as the VM cluster that k8s servers are about to join. Its leftover state risks a split brain, so it goes before the replacement lands.

- remove `apps/overlays/au-syd1/consul`, dropping `platform-consul` from the platform ApplicationSet and cascading deletion of the `consul` namespace and PVCs
- keep `apps/base/consul` for reuse by the replacement

Reviewed-on: #530
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

apps/overlays/au-syd1/consul/kustomization.yaml

@@ -1,16 +0,0 @@
----
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-resources:
-  - ../../../base/consul
-
-helmCharts:
-  - name: consul
-    repo: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/virtual/helm
-    version: "1.9.7"
-    releaseName: consul
-    namespace: consul
-    valuesFile: values.yaml
-    apiVersions:
-      - policy/v1/PodDisruptionBudget

apps/overlays/au-syd1/consul/values.yaml

@@ -1,77 +0,0 @@
-global:
-  name: consul
-  datacenter: au-syd1
-  domain: consul
-
-  acls:
-    # Enable chart-managed ACL tokens/policies for Consul system components.
-    manageSystemACLs: true
-    # Source the bootstrap/management token from a pre-existing Kubernetes secret
-    # instead of letting the chart generate one. The secret is synced from Vault
-    # via VSO (see ../../../base/consul/vaultauth.yaml and vaultstaticsecret.yaml).
-    # When this secret is populated the server-acl-init job SKIPS bootstrapping and
-    # uses the supplied token as the management token, so the k8s cluster bootstraps
-    # with the SAME initial_management token as the authoritative VM cluster.
-    bootstrapToken:
-      secretName: consul-bootstrap-acl-token
-      secretKey: token
-
-server:
-  image: hashicorp/consul:1.22.7
-  replicas: 5
-  bootstrapExpect: 5
-  storage: 10Gi
-  storageClass: cephrbd-fast-delete
-
-  connect: true
-
-  disruptionBudget:
-    maxUnavailable: 1
-
-  extraConfig: |
-    {
-      "acl": {
-        "enabled": true,
-        "default_policy": "deny",
-        "down_policy": "extend-cache",
-        "enable_token_persistence": true
-      },
-      "disable_remote_exec": true,
-      "disable_update_check": true,
-      "performance": {
-        "raft_multiplier": 10
-      },
-      "ports": {
-        "dns": 8600,
-        "grpc": 8502,
-        "http": 8500,
-        "https": -1
-      },
-      "primary_datacenter": "au-syd1"
-    }
-
-  resources:
-    requests:
-      memory: 256Mi
-      cpu: 100m
-    limits:
-      memory: 2Gi
-      cpu: "1"
-
-client:
-  enabled: false
-
-ui:
-  enabled: true
-  service:
-    type: ClusterIP
-
-connectInject:
-  enabled: false
-
-dns:
-  enabled: true
-  type: LoadBalancer
-  annotations: |
-    purelb.io/service-group: "common"
-    purelb.io/addresses: 198.18.200.5