Add postgres app.

apps/postgres/deployment.yaml

@@ -0,0 +1,40 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres-deployment
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: postgres
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: postgres:15
+          ports:
+            - containerPort: 5432
+          envFrom:
+            - secretRef:
+                name: secrets
+            - configMapRef:
+                name: config
+          env:
+            - name: PGDATA
+              value: /var/lib/postgresql/data/pgdata
+            - name: TZ
+              valueFrom:
+                configMapKeyRef:
+                  name: config
+                  key: TZ
+          volumeMounts:
+            - name: postgres-data
+              mountPath: /var/lib/postgresql/data
+      volumes:
+        - name: postgres-data
+          persistentVolumeClaim:
+            claimName: postgres-pvc