Adding Postgres Helm chart to rad init (radius-project#8072)

# Description

Adding Postgres installation to the Radius Helm chart

## Type of change

- This pull request adds or changes features of Radius and has an
approved issue (issue link required).

Fixes: radius-project#8071 
Updated issue: radius-project#8096

---------

Signed-off-by: Nick Beenham <[email protected]>

deploy/Chart/templates/database/configmaps.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: database-secret
+  namespace: "{{ .Release.Namespace }}"
+  labels:
+    control-plane: database
+    app.kubernetes.io/name: database
+    app.kubernetes.io/part-of: radius
+data:
+  POSTGRES_DB: ps_db
+  POSTGRES_USER: ps_user
+  POSTGRES_PASSWORD: SecurePassword

deploy/Chart/templates/database/service.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: database
+  namespace: "{{ .Release.Namespace }}"
+  labels:
+    app.kubernetes.io/name: database
+    app.kubernetes.io/part-of: radius
+spec:
+  ports:
+    - port: 5432
+      name: postgres
+      protocol: TCP
+      targetPort: 5432
+  selector:
+      app.kubernetes.io/name: database

deploy/Chart/templates/database/serviceaccount.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: database
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app.kubernetes.io/name: database
+    app.kubernetes.io/part-of: radius

deploy/Chart/templates/database/statefulset.yaml

@@ -0,0 +1,52 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: database
+  namespace: "{{ .Release.Namespace }}"
+  labels:
+    control-plane: database
+    app.kubernetes.io/name: database
+    app.kubernetes.io/part-of: radius
+spec:
+  serviceName: "database"
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: database
+  template:
+    metadata:
+      labels:
+        control-plane: database
+        app.kubernetes.io/name: database
+        app.kubernetes.io/part-of: radius
+    spec:
+      serviceAccountName: database
+      containers:
+      - name: database
+        securityContext:
+          allowPrivilegeEscalation: false
+        image: "{{ .Values.database.image }}:{{ .Values.database.tag }}"
+        imagePullPolicy: IfNotPresent
+        resources:
+          requests:
+            memory: "{{ .Values.database.resources.requests.memory }}"
+            cpu: "{{ .Values.database.resources.requests.cpu }}"
+          limits:
+            memory: "{{ .Values.database.resources.limits.memory }}"
+            cpu: "{{ .Values.database.resources.limits.cpu }}"
+        envFrom:
+        - configMapRef:
+            name: database-secret
+        ports:
+        - containerPort: 5432
+          name: postgres
+
+  volumeClaimTemplates:
+  - metadata:
+      name: database
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      storageClassName: "{{ .Values.database.storageClassName }}"
+      resources:
+        requests:
+          storage: {{ .Values.database.storageSize }}

deploy/Chart/values.yaml

@@ -112,3 +112,17 @@ dashboard:
       memory: "60Mi"
     limits:
       memory: "300Mi"
+
+database:
+  image: ghcr.io/radius-project/mirror/postgres
+  tag: latest
+  storageClassName: "standard" # set to the storage class name if required
+  # Minimum resource requirements, may need to revisit and scale.
+  storageSize: "1Gi"
+  resources:
+    requests:
+      cpu: "2"
+      memory: "512Mi"
+    limits:
+      cpu: "2"
+      memory: "1024Mi"