feat(postgres): add demo cluster

postgres/app/helmrelease.yaml

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+---
+apiVersion: helm.toolkit.fluxcd.io/v2
+kind: HelmRelease
+metadata:
+  name: postgres
+  namespace: ${TENANT_NAMESPACE}
+spec:
+  serviceAccountName: ${TECHNICAL_ACCOUNT}
+  interval: 30m
+  chart:
+    spec:
+      chart: cluster
+      version: 0.3.1
+      sourceRef:
+        kind: HelmRepository
+        name: cloudnative-pg
+        namespace: ${TENANT_NAMESPACE}
+  install:
+    remediation:
+      retries: 3
+  upgrade:
+    cleanupOnFail: true
+    remediation:
+      strategy: rollback
+      retries: 3
+  values:
+    type: postgresql
+    mode: standalone
+    version:
+      postgresql: "17.5"
+    cluster:
+      instances: 3
+      storage:
+        size: 10Gi
+        storageClass: ocs-storagecluster-ceph-rbd
+      walStorage:
+        # It's not mandatory to split WAL from the main data volume. 
+        # However, doing so helps to avoid issues with the main data volume 
+        # in cases where WAL exporting to the backup server experiences
+        # issues. For example, in scenarios where there's network congestion
+        # or even failures, the WAL may end up accumulating too much data
+        # to the point where the volume fills up, blocking the cluster from
+        # operating properly.
+        enabled: true 
+        size: 10Gi 
+        storageClass: ocs-storagecluster-ceph-rbd
+      resources:
+        requests:
+          cpu: "500m"
+          memory: 1Gi
+        limits:
+          cpu: "1"
+          memory: 1Gi
+      enableSuperuserAccess: true
+      superuserSecret: postgres-superuser
+      affinity:
+        topologyKey: failure-domain.beta.kubernetes.io/zone
+      postgresql:
+        parameters:
+          shared_buffers: 256MB
+          max_connections: "400"
+      initdb:
+        database: app
+        owner: app
+        options: []
+        encoding: UTF8
+    backups:
+      # Backups are disabled in this example, but here's an example
+      # on how to configure this cluster to export backups to a S3
+      # bucket hosted on a MinIO server. 
+      # 
+      # For more information, refer to the helm chart's values.yaml 
+      # or the official documentation at 
+      # https://cloudnative-pg.io/documentation/1.26/backup/
+      enabled: false
+      endpointURL: https://glacier-1.kvant.cloud
+      provider: s3
+      s3:
+        bucket: phoenix-openshift-backups
+        path: /demo-postgres
+        # Ideally, you will never commit credentials in plain text;
+        # these values are here just for illustration. For a way to
+        # properly load them from kubernetes' secrets, refer to the
+        # commented-ou section 'valuesFrom' placed right below
+        accessKey: your-access-key
+        secretKey: your-secret-key
+      secret:
+        create: true
+      wal:
+        encryption: ""
+      data:
+        encryption: ""
+      scheduledBackups:
+        - name: daily-minio
+          schedule: "@daily"
+          backupOwnerReference: self
+          method: barmanObjectStore
+      retentionPolicy: "180d" # It is mandatory to match this value with the bucket's retention period
+#  valuesFrom:
+#    - kind: Secret
+#      name: postgres-backup-s3 # name of the pre-existing secret that holds the key pair
+#      valuesKey: ACCESS_KEY_ID # name of the key inside the secret that holds the access key value
+#      targetPath: backups.s3.accessKey # path of the configuration that will be assigned the access key value
+#      optional: false
+#    - kind: Secret
+#      name: postgres-backup-s3 # name of the pre-existing secret that holds the key pair
+#      valuesKey: ACCESS_SECRET_KEY # name of the key inside the secret that holds the secret key value
+#      targetPath: backups.s3.secretKey # path of the configuration that will be assigned the secret key value
+#      optional: false

postgres/ks.yaml

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+---
+# yaml-language-server: $schema=https://kubernetes-schemas.pages.dev/kustomize.toolkit.fluxcd.io/kustomization_v1.json
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: &app postgres
+  namespace: ${TENANT_NAMESPACE}
+spec:
+  targetNamespace: ${TENANT_NAMESPACE}
+  commonMetadata:
+    labels:
+      app.kubernetes.io/name: *app
+  path: ./postgres/app
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    name: tenant-repos
+  wait: true
+  interval: 10m
+  retryInterval: 1m
+  timeout: 5m
+  dependsOn:
+    - name: vars