feat(pangolin): Switch Pangolin database from SQLite to PostgreSQL

Deploy a dedicated PostgreSQL 17 instance in the pangolin namespace
and switch Pangolin (fosrl/pangolin) to the postgresql-1.21.1 image
variant. The database URL is provided via a sealed secret and pulled
into the Pangolin container as DATABASE_URL, which the PostgreSQL
Pangolin build reads at startup.

- New: postgres.yaml (Deployment + PVC on hcloud-volumes-encrypted + Service)
- New: pangolin-postgres-secrets-sealed.yaml (postgres creds + connection string)
- pangolin-deployment.yaml: image -> fosrl/pangolin:postgresql-1.21.1,
  DATABASE_URL from secret, /app/config PVC mount, init container waits
  for postgres, removed obsolete DATABASE_PATH env
- pangolin-config.yaml: dropped SQLite database.path stanza

Fixes DEV-451.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/pangolin/pangolin-config.yaml

@@ -29,9 +29,6 @@ data:
       signup: true
       verification: false
 
-    database:
-      path: "/data/pangolin.db"
-
     oidc:
       enabled: true
       issuer: "https://auth.basicstack.de"

apps/pangolin/pangolin-deployment.yaml

@@ -1,5 +1,5 @@
 ---
-# Pangolin Data PersistentVolumeClaim
+# Pangolin Data PersistentVolumeClaim (retained for pangolin runtime files at /app/config)
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
@@ -33,9 +33,33 @@ spec:
       labels:
         app: pangolin
     spec:
+      initContainers:
+      - name: wait-for-postgres
+        image: postgres:17.5
+        command:
+        - /bin/sh
+        - -c
+        - |
+          set -e
+          until pg_isready -h pangolin-postgres.pangolin.svc.cluster.local -p 5432 -U "$POSTGRES_USER" -d "$POSTGRES_DB"; do
+            echo "waiting for postgres..."
+            sleep 2
+          done
+          echo "postgres is ready"
+        env:
+        - name: POSTGRES_USER
+          valueFrom:
+            secretKeyRef:
+              name: pangolin-postgres-secrets
+              key: postgres-user
+        - name: POSTGRES_DB
+          valueFrom:
+            secretKeyRef:
+              name: pangolin-postgres-secrets
+              key: postgres-db
       containers:
       - name: pangolin
-        image: fosrl/pangolin:1.21.1
+        image: fosrl/pangolin:postgresql-1.21.1
         ports:
         - containerPort: 3000
           name: api
@@ -44,8 +68,12 @@ spec:
         env:
         - name: PANGOLIN_URL
           value: "https://pangolin.basicstack.de"
-        - name: DATABASE_PATH
+        # PostgreSQL database URL (Pangolin PostgreSQL variant reads this at startup)
-          value: "/data/pangolin.db"
+        - name: DATABASE_URL
+          valueFrom:
+            secretKeyRef:
+              name: pangolin-postgres-secrets
+              key: connection-string
         # OIDC Configuration
         - name: OIDC_ENABLED
           value: "true"
@@ -73,7 +101,7 @@ spec:
               key: admin-password
         volumeMounts:
         - name: pangolin-data
-          mountPath: /data
+          mountPath: /app/config
         - name: config
           mountPath: /app/config/config.yml
           subPath: config.yml

apps/pangolin/pangolin-postgres-secrets-sealed.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: bitnami.com/v1alpha1
+kind: SealedSecret
+metadata:
+  creationTimestamp: null
+  name: pangolin-postgres-secrets
+  namespace: pangolin
+spec:
+  encryptedData:
+    connection-string: 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
+    postgres-db: 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
+    postgres-password: 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
+    postgres-user: 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
+  template:
+    metadata:
+      creationTimestamp: null
+      name: pangolin-postgres-secrets
+      namespace: pangolin

apps/pangolin/postgres.yaml

@@ -0,0 +1,116 @@
+---
+# PostgreSQL PersistentVolumeClaim
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pangolin-postgres-data
+  namespace: pangolin
+  annotations:
+    argocd.argoproj.io/sync-options: Delete=false
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: hcloud-volumes-encrypted
+  resources:
+    requests:
+      storage: 10Gi
+---
+# PostgreSQL Service (headless-friendly ClusterIP)
+apiVersion: v1
+kind: Service
+metadata:
+  name: pangolin-postgres
+  namespace: pangolin
+  labels:
+    app: pangolin-postgres
+spec:
+  type: ClusterIP
+  selector:
+    app: pangolin-postgres
+  ports:
+    - name: postgres
+      port: 5432
+      targetPort: 5432
+      protocol: TCP
+---
+# PostgreSQL Deployment (single-replica; PVC is RWO)
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pangolin-postgres
+  namespace: pangolin
+  labels:
+    app: pangolin-postgres
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: pangolin-postgres
+  template:
+    metadata:
+      labels:
+        app: pangolin-postgres
+    spec:
+      securityContext:
+        fsGroup: 999
+      containers:
+        - name: postgres
+          image: postgres:17.5
+          imagePullPolicy: IfNotPresent
+          ports:
+            - containerPort: 5432
+              name: postgres
+          env:
+            - name: POSTGRES_USER
+              valueFrom:
+                secretKeyRef:
+                  name: pangolin-postgres-secrets
+                  key: postgres-user
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: pangolin-postgres-secrets
+                  key: postgres-password
+            - name: POSTGRES_DB
+              valueFrom:
+                secretKeyRef:
+                  name: pangolin-postgres-secrets
+                  key: postgres-db
+            - name: PGDATA
+              value: /var/lib/postgresql/data/pgdata
+          volumeMounts:
+            - name: data
+              mountPath: /var/lib/postgresql/data
+          resources:
+            requests:
+              memory: "256Mi"
+              cpu: "100m"
+            limits:
+              memory: "1Gi"
+              cpu: "1000m"
+          readinessProbe:
+            exec:
+              command:
+                - /bin/sh
+                - -c
+                - pg_isready -U "$POSTGRES_USER" -d "$POSTGRES_DB"
+            initialDelaySeconds: 10
+            periodSeconds: 5
+            timeoutSeconds: 3
+            failureThreshold: 6
+          livenessProbe:
+            exec:
+              command:
+                - /bin/sh
+                - -c
+                - pg_isready -U "$POSTGRES_USER" -d "$POSTGRES_DB"
+            initialDelaySeconds: 30
+            periodSeconds: 10
+            timeoutSeconds: 5
+            failureThreshold: 6
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: pangolin-postgres-data