add JWT secret reference

kustomize/app/deployment.yaml

@@ -28,6 +28,12 @@ spec:
                   name: kubernaut
                   key: session_secret
                   optional: true
+            - name: KUBERNAUT_JWT_SECRET
+              valueFrom:
+                secretKeyRef:
+                  name: kubernaut
+                  key: jwt_secret
+                  optional: true
           envFrom:
             - configMapRef:
                 name: kubernaut-configmap