files 10 and access.log are created on container start

I'm not sure where this issue is from but I noticed when loading my `Caddyfile` using this container I get 2 files created in my `/srv` directory called `10` and `access.log`.

Here's my `Caddyfile`.

```
0.0.0.0:2015 {
gzip
log /logs/requests.log {
rotate_size 50 # Rotate after 50 MB
rotate_age 90 # Keep rotated files for 90 days
rotate_keep 10 # Keep at most 10 log files
rotate_compress # Compress rotated log files in gzip format
}
errors /logs/errors.log {
rotate_size 50 # Rotate after 50 MB
rotate_age 90 # Keep rotated files for 90 days
rotate_keep 10 # Keep at most 10 log files
rotate_compress # Compress rotated log files in gzip format
}
fastcgi / 127.0.0.1:9000 php # php variant only
startup php-fpm7 & # php variant only
}
```

After running this the files appear in `$(pwd)/root/sites/user123/example.com/www`.
```bash
docker run -d \
-p 2015:2015 \
-v $(pwd)/.caddy/php/Caddyfile:/etc/Caddyfile \
-v $(pwd)/root/sites/user123/example.com/www:/srv \
-v $(pwd)/root/sites/user123/example.com/logs:/logs \
--name=example.com \
abiosoft/caddy:php
```