Update reverse-proxy.md

I suggest adding the name and location of Caddyfile as there is no instructions for how to create a Caddyfile.
Failure to create a Caddyfile prior to starting the container results in a directory called Caddyfile being created.

Signed-off-by: craigkh <74493036+craigkh@users.noreply.github.com>
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craigkh 2023-05-22 23:00:30 +12:00 committed by GitHub
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@ -100,7 +100,7 @@ https://<your-nc-domain>:443 {
reverse_proxy localhost:11000
}
```
Caddyfile is a text file called Caddyfile (no extension) which needs to be created in the same location as your docker-compose.yml file prior to starting the container.
Of course you need to modify `<your-nc-domain>` to the domain on which you want to run Nextcloud. Also make sure to adjust the port 11000 to match the chosen `APACHE_PORT`. **Please note:** The above configuration will only work if your reverse proxy is running directly on the host that is running the docker daemon. If the reverse proxy is running in a docker container, you can use the `--network host` option (or `network_mode: host` for docker-compose) when starting the reverse proxy container in order to connect the reverse proxy container to the host network. ***If that is not an option or not possible for you (like e.g. on Windows or if the reverse proxy is running on a different host), you can alternatively instead of `localhost` use the private ip-address of the host that is running the docker daemon. If you are not sure how to retrieve that, you can run: `ip a | grep "scope global" | head -1 | awk '{print $2}' | sed 's|/.*||'`. If the command returns a public ip-address, use `ip a | grep "scope global" | grep docker0 | awk '{print $2}' | sed 's|/.*||'` instead (the commands only work on Linux)***
**Advice:** You may have a look at [this](https://github.com/nextcloud/all-in-one/discussions/575#discussion-4055615) for a more complete example.