Add regular schedule

Periodic test runs (once per week)

.githooks/pre-commit

@@ -42,8 +42,5 @@ fi
 
 set -e
 
-# If there are whitespace errors, print the offending file names and fail.
-git diff-index --check --cached $against --
-
 # Run yamllint on yaml files
-yamllint defaults/*.yml handlers/*.yml meta/*.yml tasks/*.yml vars/*.yml
+yamllint .

.github/workflows/CI.yml

@@ -1,6 +1,11 @@
 ---
 name: Test deployment
-on: push
+'on':
+  pull_request:
+  push:
+  schedule:
+    # Run every Wednesday at 01:42
+    - cron: "42 1 * * 3"
 
 jobs:
   lint: