feat(add-ons): Add shared postgres cluster and authentik

infra/postgres/authentik-database.yaml

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+apiVersion: postgresql.cnpg.io/v1
+kind: Database
+metadata:
+  name: authentik
+  namespace: postgres
+spec:
+  cluster:
+    name: postgres
+  databaseReclaimPolicy: retain
+  name: authentik
+  owner: authentik

infra/postgres/authentik-db-sealedsecret.yaml

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+---
+apiVersion: bitnami.com/v1alpha1
+kind: SealedSecret
+metadata:
+  name: authentik-db
+  namespace: postgres
+spec:
+  encryptedData:
+    password: AgALpscM7BiDoZuUSlAI39CZYz3DvSaHQwzOpZEKp4tqfEYQ1r2DALOAbi4l3+6LzsMo63RNv3SYlhxFcbjjrDMiiaaB47iKDEmbSW/LQTJibiaoy67rgTs8T3I4awQbHeylwJQr5nS0BN6MeYh87PCmqFc3Orc5kCokSL9j7gVwOqNkq27RMJkghulUxAEONQrixFOiCHTFWCD/IybR1olUUacz7nKxCTLmcqDfzimGlF92VBbFaUzZH5W+0yd59zNqjhnmslIRiqli/ZVB2Z5ECuqr4YmrSmaCQvR5mzRmNjpmAeqCF/byFjfanPM6ZZ4NM2x7flqu8sULzZfBdXWmhIy03jPFFDBIvznHHW6y0K2r8kqewkoUsKgJEgZcsEvwe/F/gode3ukI02LuD2dKMNjeDaf8A4xaRx6h9U9cDiggmpHPW2HjO3kLp6ViEGPlGm3JuisnqncsBgfIh1T8ZMpmuM0WgAe6E3hFHnR6vbWYfSIi6nrEcpfLL+F2bBGYdUFBfjflaxXzhPnGDJ29GEBuyJcHPVRTqBhybS9rl+77dhCbPEsC5GN9MdCdS3uVWyKN+xIV1f/cJNsUFhDyU2rbkbFAebJurjPbKi92HPDaEq6OK3kunN9nNEZ9rE7d6ouw/gQ5Uq3CmaNDiVDorFfaW5DHVbRnm3MLdbLoUuN1AlU96/cDuSqDZjfLB69iB/+nt8TQLHopwQxj9AajfMyF+y9c2XvYZWvZGaCE1fTEfpIJ2fV1McnwbFi0uHk=
+    username: 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
+  template:
+    metadata:
+      labels:
+        cnpg.io/reload: "true"
+      name: authentik-db
+      namespace: postgres
+    type: kubernetes.io/basic-auth

infra/postgres/cluster.yaml

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+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: postgres
+  namespace: postgres
+spec:
+  enablePDB: false
+  imageName: ghcr.io/cloudnative-pg/postgresql:18
+  instances: 1
+  managed:
+    roles:
+      - ensure: present
+        login: true
+        name: authentik
+        passwordSecret:
+          name: authentik-db
+  postgresql:
+    # Each app role may only connect to the database of the same name.
+    pg_hba:
+      - host sameuser all all scram-sha-256
+      - host all all all reject
+  resources:
+    limits:
+      memory: 1Gi
+    requests:
+      cpu: 100m
+      memory: 256Mi
+  storage:
+    size: 5Gi

infra/postgres/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - cluster.yaml
+  - authentik-db-sealedsecret.yaml
+  - authentik-database.yaml