AGH on Docker: Where to store renewed letsencrypt cert files

Dear AGH friends,

i am very excited to use AGH with docker on a little Hetzner virtual machine. Everything works as expected. I am working with debian and the certbot packages from it to renew the letsencrypt certs.

Now i try to setup the path for the fullkey.pem and the privkey.pem keys (copy and paste with browser interface of course works) but AGH tells me that the files are not available / not found at the desired path. I put them on the config volume but it does not work. Where should i store these files to avoid manual interaction if certs are renewed?

Thanks a lot!