Add postgres deployment for element

k8s/postgres/postgres-deployment.yaml

@@ -0,0 +1,75 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres
+  namespace: postgres
+  labels:
+    k8s-app: postgres
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      k8s-app: postgres
+  template:
+    metadata:
+      labels:
+        k8s-app: postgres
+    spec:
+      containers:
+        - name: postgresql
+          image: postgres:17.0-bookworm
+          env:
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-secret
+                  key: postgres-password
+          volumeMounts:
+            - name: postgres-data
+              mountPath: /var/lib/postgresql/data
+            - name: sharemem
+              mountPath: /dev/shm
+          ports:
+            - containerPort: 5432
+              name: postgres
+              protocol: TCP
+          resources:
+            requests:
+              memory: "2Gi"
+              cpu: "500m"
+            limits:
+              memory: "4Gi"
+              cpu: "2000m"
+          livenessProbe:
+            exec:
+              command:
+                - /bin/bash
+                - -c
+                - exec pg_isready -U postgres -h 127.0.0.1 -p 5432
+            failureThreshold: 6
+            initialDelaySeconds: 20
+            periodSeconds: 10
+            successThreshold: 1
+            timeoutSeconds: 5
+          readinessProbe:
+            exec:
+              command:
+                - /bin/bash
+                - -c
+                - exec pg_isready -U postgres -h 127.0.0.1 -p 5432
+            failureThreshold: 6
+            initialDelaySeconds: 20
+            periodSeconds: 10
+            successThreshold: 2
+            timeoutSeconds: 5
+
+      volumes:
+        - name: postgres-data
+          persistentVolumeClaim:
+            claimName: postgres-pvc
+            readOnly: false
+        - emptyDir:
+            medium: Memory
+            sizeLimit: 1Gi
+          name: sharemem

k8s/postgres/postgres-namespace.yaml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: postgres
+  labels:
+    usage: postgres-btsystem

k8s/postgres/postgres-pvc.yaml

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+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: postgres-pvc
+  namespace: postgres
+spec:
+  accessModes:
+    - ReadWriteMany
+  resources:
+    requests:
+      storage: 20Gi
+  storageClassName: rook-cephfs

k8s/postgres/postgres-service.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+  namespace: postgres
+spec:
+  selector:
+    k8s-app: postgres
+  ports:
+    - name: postgres
+      protocol: TCP
+      port: 5432
+      targetPort: 5432