renovate on gcp gcs

[HaykSHS]

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A Mend.io-hosted app

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No response

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is there a way to make renovate use service account for updating my helm charts stored in gcp bucket
I'm trying this way but no success.

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": [
    "config:recommended"
  ],
  "hostRules": [
      {
        "matchHost": "storage.googleapis.com",
        "hostType": "helm",
        "username": "_json_key",
        "password": "{{ secrets.MEND_GCS_SA }}"
      }
  ],
  "packageRules": [
      {
        "matchDatasources": ["helm"],
        "registryUrls": ["https://storage.googleapis.com/my-bucket-name"],
        "packageNames": [
          "package1",
          "package2",
          "package3"
        ]
      }
    ]
}

It only works when I provide a token but gcp token's ttl is 1 hour so this is not an option

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