Re-enable scheduled builds

Author: WyriHaximus

.github/workflows/ci.yml

@@ -9,8 +9,8 @@ on:
     branches:
       - master
   pull_request:
-#  schedule:
-#    - cron:  '13 4 * * *'
+  schedule:
+    - cron:  '13 4 * * *'
 jobs:
   supported-alpine-versions:
     name: Supported Alpine versions