Grafana in docker edition - rendering timeout and issue with locking rendering keys

I’m using grafana docker edition,
I have issue with “cannot delete render key”:

level=error msg="Failed to delete render key" error="context deadline exceeded"

and also timeout issue: “context deadline exceeded”

I was reading that solve this issue is possible by change browser.ts with change of timeout settings,
But my issue is that - in the grafana-renderer container I cannot find browser.ts file and in grafana container browser.ts don’t have below field:

await page.goto(options.url, { waitUntil: 'networkidle0', timeout: 3000000 });

I saw in the solution to change browser.ts in grafana-renderer container and rebuild container.