fix(gha): create coverage on push to master (#46)

Author: billf

.github/workflows/cron.yaml

@@ -3,9 +3,11 @@ on:
   workflow_dispatch:
   schedule:
     - cron: '0 0 1 * *'
+  push:
+    branches: [ master ]
 
 permissions:
-  actions: read
+  actions: write
   contents: write
 
 jobs: