Add basic renovate config (#258)

Author: taraspos

.github/renovate.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ]
+}

.github/workflows/renovate.yml

@@ -20,5 +20,7 @@ jobs:
 
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v40.1.5
+        env:
+          RENOVATE_REPOSITORY: ${{ github.repository }}
         with:
           token: '${{ secrets.GITHUB_TOKEN }}'