feat(secrets): add sealed secret for PostgreSQL credentials

postgres/htwg-1/service.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+  namespace: postgres
+spec:
+  selector:
+    app: postgres
+  ports:
+    - port: 5432
+      targetPort: 5432

postgres/htwg-1/statefulset.yaml

@@ -0,0 +1,47 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: postgres
+  namespace: postgres
+spec:
+  selector:
+    matchLabels:
+      app: postgres
+  serviceName: postgres
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: postgres:17-alpine
+          env:
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-credentials
+                  key: postgres-password
+            - name: PGDATA
+              value: /var/lib/postgresql/data/pgdata
+          ports:
+            - containerPort: 5432
+          resources:
+            requests:
+              cpu: 100m
+              memory: 256Mi
+            limits:
+              cpu: 500m
+              memory: 512Mi
+          volumeMounts:
+            - name: data
+              mountPath: /var/lib/postgresql/data
+  volumeClaimTemplates:
+    - metadata:
+        name: data
+      spec:
+        accessModes: [ReadWriteOnce]
+        resources:
+          requests:
+            storage: 5Gi