feat: add renovate (#7)

- closes #3

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Reviewed-on: https://codeberg.org/forgejo-contrib/forgejo-helm/pulls/7

renovate.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": "config:base",
+  "assignees": ["viceice"],
+  "semanticCommits": "enabled",
+  "packageRules": [
+    {
+      "matchManagers": ["droneci"],
+      "enabled": false
+    }
+  ]
+}