feat(chart): add Helm chart for deploying Label Studio with PostgreSQL (#152)

* feat(chart): add Helm chart for deploying Label Studio with PostgreSQL

* feat(milvus): update Milvus configuration to use URI and remove deprecated host/port settings

deployment/helm/label-studio/templates/postgres.yaml

@@ -0,0 +1,62 @@
+{{- if .Values.postgres.enabled }}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "label-studio.fullname" . }}-postgres
+  labels:
+    app.kubernetes.io/name: {{ include "label-studio.name" . }}-postgres
+spec:
+  ports:
+    - port: 5432
+      targetPort: 5432
+  selector:
+    app.kubernetes.io/name: {{ include "label-studio.name" . }}-postgres
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "label-studio.fullname" . }}-postgres
+  labels:
+    app.kubernetes.io/name: {{ include "label-studio.name" . }}-postgres
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "label-studio.name" . }}-postgres
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: {{ include "label-studio.name" . }}-postgres
+    spec:
+      containers:
+        - name: postgres
+          image: "{{ .Values.postgres.image.repository }}:{{ .Values.postgres.image.tag }}"
+          imagePullPolicy: {{ .Values.postgres.image.pullPolicy }}
+          env:
+            - name: POSTGRES_HOST_AUTH_METHOD
+              value: {{ .Values.postgres.authMethod | quote }}
+            - name: POSTGRES_USER
+              value: {{ .Values.postgres.username | quote }}
+          ports:
+            - containerPort: 5432
+          volumeMounts:
+            - name: postgres-data
+              mountPath: /var/lib/postgresql/data
+      volumes:
+        - name: postgres-data
+          persistentVolumeClaim:
+            claimName: {{ include "label-studio.fullname" . }}-postgres
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "label-studio.fullname" . }}-postgres
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: {{ .Values.postgres.persistence.size }}
+{{- end }}
+