schedule tests to be run every day

so that we can detect when dictionaries in IPFS cannot be downloaded

Author: filyp

.github/workflows/python-app.yml

@@ -8,6 +8,8 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+  schedule:
+    - cron:  '0 12 * * *'
 
 jobs:
   build: