Group all GitHub Actions updates into a single weekly PR

Author: trask

.github/renovate.json5

@@ -16,6 +16,16 @@
     'dependencies',
   ],
   packageRules: [
+    {
+      // group all GitHub Actions updates into a single weekly PR
+      groupName: 'github actions',
+      matchManagers: [
+        'github-actions',
+      ],
+      schedule: [
+        'before 8am on Tuesday',
+      ],
+    },
     {
       // reduces the number of Renovate PRs
       // (patch updates are typically non-breaking)