Rename resolver

If there is the need to rename your existing resolver (provider name) start a Bash session in your container

docker exec -it <containername> bash

and edit the provider_name file - pay attention, it's a single-line file

vim /opt/dnscrypt-wrapper/etc/keys/provider_name

Now restart the container or even just the dnscrypt-wrapper process.

If your resolver is public don't forget to adapt (columns 'Name' and 'Provider name') the server list and submit a pull request.