Update renovate.json

.github/renovate.json

@@ -2,6 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["github>woodpecker-ci/renovate-config"],
   "automergeType": "pr",
+  "baseBranches": ["main", "/^release\\/.*/"]
   "customManagers": [
     {
       "customType": "regex",
@@ -13,6 +14,10 @@
     }
   ],
   "packageRules": [
+    {
+      "matchBaseBranches": ["/^release\\/.*/"],
+      "dependencyDashboardApproval": true
+    },
     {
       "matchCurrentVersion": "<1.0.0",
       "matchPackageNames": ["github.com/distribution/reference"],