Add renovate.json (#285)

Author: biglittlebigben

renovate.json

@@ -1,6 +1,29 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
-    "config:recommended"
+    "config:base"
+  ],
+  "commitBody": "Generated by renovateBot",
+  "packageRules": [
+    {
+      "matchManagers": ["github-actions"],
+      "groupName": "github workflows"
+    },
+    {
+      "matchManagers": ["dockerfile"],
+      "groupName": "docker deps"
+    },
+    {
+      "matchManagers": ["gomod"],
+      "groupName": "go deps"
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchPackagePrefixes": ["github.com/livekit"],
+      "groupName": "livekit deps"
+    }
+  ],
+  "postUpdateOptions": [
+    "gomodTidy"
   ]
 }