Run tests on a schedule

Author: horgh

.github/workflows/rubocop.yml

@@ -1,5 +1,11 @@
 name: Run rubocop
-on: [push, pull_request]
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '3 20 * * SUN'
+
 jobs:
   rubocop:
     runs-on: ubuntu-latest

.github/workflows/test.yml

@@ -1,5 +1,11 @@
 name: Run tests
-on: [push, pull_request]
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '3 21 * * SUN'
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}