netbird: pull encryptionKey from k8s secret

modules/k3s/netbird/server.yaml

@@ -22,6 +22,12 @@ spec:
             - containerPort: 3479
               protocol: UDP
             - containerPort: 33073
+          env:
+            - name: NETBIRD_STORE_ENCRYPTION_KEY
+              valueFrom:
+                secretKeyRef:
+                  name: netbird-encryption
+                  key: encryptionKey
           volumeMounts:
             - name: config
               mountPath: /etc/netbird