This datasource finds Nextcloud application updates from Nextcloud feeds.

By default, Renovate has no default registry url for this datasource. You need to override the default behavior with the `registryUrls` config option.
For example:

```json
{
  "packageRules": [
    {
      "matchDatasources": ["nextcloud"],
      "registryUrls": [
        "https://apps.nextcloud.com/api/v1/platform/30.0.0/apps.json"
      ]
    }
  ]
}
```

Additionally, if you want Renovate to automatically update the platform version, you can create a custom manager.
For example:

```json
{
  "customManagers": [
    {
      "customType": "regex",
      "managerFilePatterns": ["/(^|/)renovate.json$/"],
      "matchStrings": [
        "https://apps.nextcloud.com/api/v1/platform/(?<currentValue>\\d+\\.\\d+\\.\\d+)/apps.json"
      ],
      "depNameTemplate": "nextcloud/server",
      "datasourceTemplate": "github-releases"
    }
  ]
}
```