I believe `specialized-workers` is a better name than `room-workers`,
because when enabled, 4 different types of specialized workers are
created:
- Room workers
- Sync workers
- Client readers
- Federation readers
Only one of these is called room-workers.
In the future, more specialized workers may be added, making the
`room-workers` preset name an even poorer choice.
Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3100
These `init.yml` (now `inject_into_nginx_proxy.yml`) tasks do not need
to `always` run. They only need to run for `setup-all` and
`setup-nginx-proxy`. Unless we're dealing with these 2 tags, we can
spare ourselves a lot of work.
This patch also moves the `when` statement from `init.yml` into
`main.yml` in an effort to further optimize things by potentially
avoiding the extra file include.