test(GHA): Enable cron build for static-builds.yml

Author: erikmd

.github/workflows/static-builds.yml

@@ -8,6 +8,9 @@ on:
   pull_request:
     branches:
       - '**'
+  schedule:
+    # test master every Saturday at 08:00 UTC
+    - cron: '0 8 * * 6'
 jobs:
   static-bin-linux:
     name: Builds static Linux binaries