feat(k8s): déployer Open WebUI + n8n sur namespace ai via ArgoCD

Open WebUI (openwebui.lab.local) :
- Connecté à LiteLLM (192.168.10.1:4000/v1) comme backend OpenAI-compatible
- PostgreSQL via storage-01 pour l'historique des conversations
- PVC 5Gi NFS pour les uploads, Traefik IngressRoute

n8n (n8n.lab.local) :
- PostgreSQL via storage-01, chiffrement des credentials
- PVC 2Gi NFS, Traefik IngressRoute
- Webhook URL interne : http://n8n.lab.local

Ansible : ajoute openwebui et n8n dans postgresql_databases/users
(vault_pg_openwebui_password + vault_pg_n8n_password à ajouter au vault)

Prérequis avant 1er déploiement :
  make vault-edit   # ajouter les 2 passwords
  make apply-storage --tags postgresql
  kubectl create secret generic open-webui-secret -n ai ...
  kubectl create secret generic n8n-secret -n ai ...

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

k8s/apps/n8n/deployment.yaml

@@ -0,0 +1,82 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: n8n
+  namespace: ai
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: n8n
+  template:
+    metadata:
+      labels:
+        app: n8n
+    spec:
+      containers:
+        - name: n8n
+          image: n8nio/n8n:latest
+          ports:
+            - containerPort: 5678
+          env:
+            # PostgreSQL
+            - name: DB_TYPE
+              value: "postgresdb"
+            - name: DB_POSTGRESDB_HOST
+              value: "192.168.10.1"
+            - name: DB_POSTGRESDB_PORT
+              value: "5432"
+            - name: DB_POSTGRESDB_DATABASE
+              value: "n8n"
+            - name: DB_POSTGRESDB_USER
+              value: "n8n"
+            - name: DB_POSTGRESDB_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: n8n-secret
+                  key: db-password
+            # Clé de chiffrement des credentials
+            - name: N8N_ENCRYPTION_KEY
+              valueFrom:
+                secretKeyRef:
+                  name: n8n-secret
+                  key: encryption-key
+            # URLs
+            - name: N8N_HOST
+              value: "0.0.0.0"
+            - name: N8N_PORT
+              value: "5678"
+            - name: N8N_PROTOCOL
+              value: "http"
+            - name: WEBHOOK_URL
+              value: "http://n8n.lab.local"
+            - name: N8N_EDITOR_BASE_URL
+              value: "http://n8n.lab.local"
+            # Timezone
+            - name: GENERIC_TIMEZONE
+              value: "Europe/Paris"
+            - name: TZ
+              value: "Europe/Paris"
+            # Désactiver la télémétrie
+            - name: N8N_DIAGNOSTICS_ENABLED
+              value: "false"
+          volumeMounts:
+            - name: data
+              mountPath: /home/node/.n8n
+          resources:
+            requests:
+              cpu: 200m
+              memory: 256Mi
+            limits:
+              cpu: 1000m
+              memory: 1Gi
+          readinessProbe:
+            httpGet:
+              path: /healthz
+              port: 5678
+            initialDelaySeconds: 20
+            periodSeconds: 10
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: n8n-data

k8s/apps/n8n/ingress.yaml

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+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: n8n
+  namespace: ai
+spec:
+  entryPoints:
+    - web
+  routes:
+    - match: Host(`n8n.lab.local`)
+      kind: Rule
+      services:
+        - name: n8n
+          port: 5678

k8s/apps/n8n/pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: n8n-data
+  namespace: ai
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: nfs
+  resources:
+    requests:
+      storage: 2Gi

k8s/apps/n8n/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: n8n
+  namespace: ai
+spec:
+  selector:
+    app: n8n
+  ports:
+    - port: 5678
+      targetPort: 5678

k8s/apps/open-webui/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: open-webui
+  namespace: ai
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: open-webui
+  template:
+    metadata:
+      labels:
+        app: open-webui
+    spec:
+      containers:
+        - name: open-webui
+          image: ghcr.io/open-webui/open-webui:latest
+          ports:
+            - containerPort: 8080
+          env:
+            # LiteLLM comme backend OpenAI-compatible
+            - name: OPENAI_API_BASE_URL
+              value: "http://192.168.10.1:4000/v1"
+            - name: OPENAI_API_KEY
+              valueFrom:
+                secretKeyRef:
+                  name: open-webui-secret
+                  key: litellm-api-key
+            # PostgreSQL — migrations automatiques au démarrage
+            - name: DATABASE_URL
+              valueFrom:
+                secretKeyRef:
+                  name: open-webui-secret
+                  key: database-url
+            # Clé de session
+            - name: WEBUI_SECRET_KEY
+              valueFrom:
+                secretKeyRef:
+                  name: open-webui-secret
+                  key: webui-secret-key
+            # Désactiver Ollama (on passe par LiteLLM)
+            - name: ENABLE_OLLAMA_API
+              value: "false"
+            - name: OLLAMA_BASE_URL
+              value: ""
+            # Nom affiché dans l'interface
+            - name: WEBUI_NAME
+              value: "Funk AI"
+            - name: DEFAULT_LOCALE
+              value: "fr-FR"
+          volumeMounts:
+            - name: data
+              mountPath: /app/backend/data
+          resources:
+            requests:
+              cpu: 200m
+              memory: 256Mi
+            limits:
+              cpu: 1000m
+              memory: 1Gi
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 8080
+            initialDelaySeconds: 30
+            periodSeconds: 10
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: open-webui-data

k8s/apps/open-webui/ingress.yaml

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+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: open-webui
+  namespace: ai
+spec:
+  entryPoints:
+    - web
+  routes:
+    - match: Host(`openwebui.lab.local`)
+      kind: Rule
+      services:
+        - name: open-webui
+          port: 8080

k8s/apps/open-webui/pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: open-webui-data
+  namespace: ai
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: nfs
+  resources:
+    requests:
+      storage: 5Gi

k8s/apps/open-webui/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: open-webui
+  namespace: ai
+spec:
+  selector:
+    app: open-webui
+  ports:
+    - port: 8080
+      targetPort: 8080