fix(renovate): default endpoint to gitea API URL

Fall back to https://gitea.forust.xyz/api/v1 when RENOVATE_ENDPOINT is unset, in both local config and in-cluster ConfigMap.

renovate/k8s/configmap.yaml

@@ -7,7 +7,7 @@ data:
   config.js: |
     module.exports = {
       platform: 'gitea',
-      endpoint: process.env.RENOVATE_ENDPOINT,
+      endpoint: process.env.RENOVATE_ENDPOINT || 'https://gitea.forust.xyz/api/v1',
       enabledManagers: ['docker-compose', 'kubernetes', 'helm-values'],
       'helm-values': {
         managerFilePatterns: ['/k8s/.+values\\.ya?ml$/'],