odoo/custom/conf.d/50-queue.conf

I propose for this queue configuration odoo/custom/conf.d/50-queue.conf to use env as bellow:

```
[queue_job]
channels = root:2
jobrunner_db_host = $PGHOST
jobrunner_db_port = $PGPORT
jobrunner_db_user = $PGUSER
jobrunner_db_password = $PGPASSWORD
```