Add postgres app.

apps/postgres/README.md

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+# Postgress app
+
+## Required .env variables
+
+```
+POSTGRES_DB
+POSTGRES_USER
+POSTGRES_PASSWORD
+PGDATA
+```

apps/postgres/deployment.yaml

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+---
+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

apps/postgres/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: postgres
+labels:
+  - includeSelectors: true
+    pairs:
+      app: postgres
+      managedBy: kustomize
+      partOf: sovereign-cloud
+resources:
+  - deployment.yaml
+  - namespace.yaml
+  - service.yaml
+  - pvc.yaml
+configMapGenerator:
+  - name: config
+    envs:
+      - config/config.env
+secretGenerator:
+  - name: secrets
+    envs:
+      - config/secrets.env
+
+replacements:
+  - source:
+      kind: ConfigMap
+      name: config
+      fieldPath: data.POSTGRES_STORAGE
+    targets:
+      - fieldPaths:
+          - spec.resources.requests.storage
+        select:
+          kind: PersistentVolumeClaim
+          name: postgresql-pvc

apps/postgres/manifest.yaml

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+name: postgres
+install: true
+description: PostgreSQL is a powerful, open source object-relational database system.
+version: 1.0.0
+icon: https://www.postgresql.org/media/img/about/press/elephant.png

apps/postgres/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: postgres

apps/postgres/pvc.yaml

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+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: postgres-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: longhorn
+  resources:
+    requests:
+      storage: 2Gi

apps/postgres/service.yaml

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+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+spec:
+  ports:
+    - port: 5432
+  selector:
+    app: postgres