Docker jitsi meet

Good morning, currently I needed to configure the prosody file
nano /etc/prosody/conf.d/

I have my docker-based installation,

but inside the prosody container neither this path nor this file exists, for which I check the dockerfile to see how the prosody container is built and notice something strange that I would like you to inform me if any of you know why the following happens:


In line 38 the path etc / prosody is deleted from the container, so I can’t access the file I need, because they delete the folder from the container? in that case how do I configure my file?