TaskBroker change database to PostgreSQL

### Problem Statement

I see that https://github.com/getsentry/taskbroker can support PostgreSQL instead of SQLite for it's database and we are getting

```
sentry 2026-09-13T10:04:33.710675Z ERROR reduce:flush_reducer:flush: taskbroker::kafka::activation_writer: Unable to write to sqlite: pool timed out while waiting for an open connection
```

And new errors are not getting written, And it will get temporary fixed after restart

### Solution Brainstorm

a seperated container for the PostgreSQL for the taskbroker or a simple guideline on how to add this part