feat: add migration from Crunchy operator

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>

Author: gbartolini

content/posts/20260513-crunchy-to-cloudnativepg-pg18/cover.jpg

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+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: pg-app
+spec:
+  instances: 1
+  imageCatalogRef:
+    apiGroup: postgresql.cnpg.io
+    kind: ClusterImageCatalog
+    name: postgresql-minimal-trixie
+    major: 18
+  storage:
+    size: 5Gi
+  postgresql:
+    extensions:
+      - name: pgaudit
+    parameters:
+      pgaudit.log: "all, -misc"
+      pgaudit.log_catalog: "off"
+      pgaudit.log_parameter: "on"
+      pgaudit.log_relation: "on"
+  bootstrap:
+    initdb:
+      import:
+        type: microservice
+        databases:
+        - app
+        source:
+          externalCluster: crunchy
+  externalClusters:
+  - name: crunchy
+    connectionParameters:
+      host: crunchy-primary.default.svc
+      port: "5432"
+      user: cnpg
+      dbname: app
+    password:
+      name: crunchy-pguser-cnpg
+      key: password

content/posts/20260513-crunchy-to-cloudnativepg-pg18/index.md

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+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: pg-app
+spec:
+  instances: 1
+  imageCatalogRef:
+    apiGroup: postgresql.cnpg.io
+    kind: ClusterImageCatalog
+    name: postgresql-minimal-trixie
+    major: 18
+  storage:
+    size: 5Gi
+  postgresql:
+    extensions:
+      - name: pgaudit
+    parameters:
+      pgaudit.log: "all, -misc"
+      pgaudit.log_catalog: "off"
+      pgaudit.log_parameter: "on"
+      pgaudit.log_relation: "on"
+  bootstrap:
+    initdb:
+      import:
+        type: microservice
+        schemaOnly: true
+        databases:
+        - app
+        source:
+          externalCluster: crunchy
+  externalClusters:
+  - name: crunchy
+    connectionParameters:
+      host: crunchy-primary.default.svc
+      port: "5432"
+      user: cnpg
+      dbname: app
+    password:
+      name: crunchy-pguser-cnpg
+      key: password

content/posts/20260513-crunchy-to-cloudnativepg-pg18/thumb.jpg

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+apiVersion: postgres-operator.crunchydata.com/v1beta1
+kind: PostgresCluster
+metadata:
+  name: crunchy
+spec:
+  postgresVersion: 17
+  patroni:
+    dynamicConfiguration:
+      postgresql:
+        parameters:
+          wal_level: logical
+  instances:
+  - name: instance1
+    replicas: 1
+    dataVolumeClaimSpec:
+      accessModes:
+      - ReadWriteOnce
+      resources:
+        requests:
+          storage: 5Gi
+  backups:
+    pgbackrest:
+      repos:
+      - name: repo1
+        volume:
+          volumeClaimSpec:
+            accessModes:
+            - ReadWriteOnce
+            resources:
+              requests:
+                storage: 5Gi
+  users:
+  - name: app
+    databases:
+    - app
+  - name: cnpg
+    databases:
+    - app
+    options: "SUPERUSER"

content/posts/20260513-crunchy-to-cloudnativepg-pg18/yaml/cluster-offline.yaml

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+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: sample-data-init
+spec:
+  template:
+    spec:
+      restartPolicy: Never
+      containers:
+      - name: psql
+        image: ghcr.io/cloudnative-pg/postgresql:18-minimal-trixie
+        env:
+        - name: PGPASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: crunchy-pguser-cnpg
+              key: password
+        command:
+        - psql
+        - -h
+        - crunchy-primary.default.svc
+        - -U
+        - cnpg
+        - app
+        - -c
+        - |
+          CREATE TABLE orders (
+            id SERIAL PRIMARY KEY,
+            description TEXT NOT NULL,
+            created_at TIMESTAMPTZ DEFAULT now()
+          );
+          INSERT INTO orders (description)
+          SELECT 'Order ' || g FROM generate_series(1, 1000) AS g;

content/posts/20260513-crunchy-to-cloudnativepg-pg18/yaml/cluster-online.yaml

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+apiVersion: postgresql.cnpg.io/v1
+kind: Subscription
+metadata:
+  name: pg-app-migration
+spec:
+  cluster:
+    name: pg-app
+  dbname: app
+  name: migration
+  externalClusterName: crunchy
+  publicationName: migration
+  subscriptionReclaimPolicy: delete