try this instead

clusters/main/kubernetes/apps/renovate/app/helm-release.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: renovate
-      version: 1.11.1
+      version: 1.11.2
       sourceRef:
         kind: HelmRepository
         name: truecharts
@@ -41,9 +41,16 @@ spec:
                 # You can set RENOVATE_AUTODISCOVER to true to run Renovate on all repos you have push access to
                 RENOVATE_AUTODISCOVER: 'false'
                 RENOVATE_TOKEN: '${GITHUB_PAT}'
-                RENOVATE_CONFIG_FILE: /tmp/renovate/config.json
+                RENOVATE_CONFIG_FILE: /tmp/renovate/renovate-config.js
                 LOGLEVEL: debug
 
     configmap:
       config:
         enabled: false
+
+    persistence:
+      configmap-vol:
+        enabled: true
+        type: configmap
+        objectName: renovate-config
+        expandObjectName: false