chore: add Renovate config

Author: dragon3

.github/workflows/validate-renovate-config.yaml

@@ -0,0 +1,15 @@
+name: Validate Renovate config
+
+on:
+  pull_request:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Validate Renovate config
+        uses: suzuki-shunsuke/github-action-renovate-config-validator@c22827f47f4f4a5364bdba19e1fe36907ef1318e # v1.1.1
+        with:
+          config_file_path: renovate.json

renovate.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["github>tailor-inc/renovate-config"]
+}