Add renovatebot configuration

The configuration tells the bot to update lockfiles once per week.

Author: renovate-bot

.github/renovate.json5

@@ -0,0 +1,15 @@
+{
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    // Let Renovatebot keep an opened issue that tracks our dependencies
+    "dependencyDashboard": true,
+    // Update/rebase existing PRs even outside the scheduled time
+    "updateNotScheduled": false,
+    // Disable "normal" package updates
+    "enabledManagers": [],
+    "lockFileMaintenance": {
+        "enabled": true,
+        "schedule": [
+            "before 5am on Monday"
+        ]
+    }
+}