Nginx-Config preventing extension FoF-sitemap from working correctly

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I've found a bug and checked that ...

[ ] ... the documentation does not mention anything about my problem
[X] ... there are no open or closed issues that are related to my problem

Description

Hi there,

I'm using your container on Unraid and so far it works fine. But when trying to generate a sitemap.xml via the extension FoF-sitemap, it will fail due to a missing nginx config parameter.

Expected behaviour

/sitemap.xml should be public accessible

Actual behaviour

accessing /sitemap.xml will result in an Nginx Error 404

Steps to reproduce

Just run the container, install the FoF-sitemap extension and try to access the URL

Docker info

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  compose: Docker Compose (Docker Inc., v2.17.3)

Server:
 Containers: 14
  Running: 14
  Paused: 0
  Stopped: 0
 Images: 17
 Server Version: 20.10.21
 Storage Driver: btrfs
  Build Version: Btrfs v5.10.1 
  Library Version: 102
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 1c90a442489720eec95342e1789ee8a5e1b9536f
 runc version: v1.1.4-0-g5fd4c4d1
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 5.19.17-Unraid
 Operating System: Slackware 15.0 x86_64 (post 15.0 -current)
 OSType: linux
 Architecture: x86_64
 CPUs: 12
 Total Memory: 62.7GiB
 Name: store1
 ID: DEOO:ROO3:EEH7:N7ZN:KR3P:D3F4:EO75:74ML:X2DN:UPC5:ARBI:CM57
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false
 Product License: Community Engine

Docker Compose config

No response

Logs

I don't have any.
But here is the necessary config statement, which has to be added to nginx.conf:

location = /sitemap.xml {
                try_files $uri $uri/ /index.php?$query_string;
}

Additional info

An immediate implementation would be wonderful. Thanks

crazy-max / docker-flarum

Nginx-Config preventing extension FoF-sitemap from working correctly #83