Run cache job on schedule

Author: shivammathur

.github/workflows/cache.yml

@@ -1,10 +1,12 @@
 name: 'Cache PHP'
 on:
+  schedule:
+    - cron:  '15 1 */15 * *'
   workflow_dispatch:
     inputs:
       php-versions:
         description: 'PHP version to cache'
-        default: '5.3 5.4 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4'
+        default: '8.1 8.2 8.3 8.4'
         required: false
 jobs:
   get-matrix: