Fix secrets in notebooks deployments

cesnet-central/playbooks/notebooks.yaml

@@ -33,7 +33,7 @@
     - name: Copy config file to master
       vars:
         name: "{{ item | basename | splitext | first }}"
-        secret: "{{ secrets['central'] }}"
+        secret: "{{ secrets[name] }}"
         gateways_token: "{{ gateways_token }}"
       template:
         src: "{{ item }}"