Entries are being duplicated as described in

* https://github.com/saltstack/salt/issues/60220 and
* https://github.com/saltstack/salt/issues/59785#issuecomment-826590482

* correctly set dependencies in configuration
* update RPM repo key
* add tests for passenger installation as nginx module
* update test matrix

* Close #261
* https://nginx.org/en/docs/ngx_core_module.html#worker_connections

```bash
Examining nginx/map.jinja of type state
[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:175
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:181
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:188
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:192
    })%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:195
    })%}
```

BREAKING CHANGE: all previous `nginx` based configurations must be reviewed;
`nginx.ng` usage must be promoted to `nginx` and any uses of the original
`nginx` will have to be converted.

like openSUSE and SLES