Add renovate.json5

Author: fisker

.github/renovate.json5

@@ -0,0 +1,14 @@
+{
+  $schema: "https://docs.renovatebot.com/renovate-schema.json",
+  dependencyDashboardApproval: true,
+  packageRules: [
+    {
+      groupName: "GitHub Actions",
+      matchManagers: ["github-actions"],
+    },
+    {
+      groupName: "devDependencies",
+      matchDepTypes: ["devDependencies"],
+    },
+  ]
+}