document how to use federation

[szaimen]

I already started with it but it did not work yet. Not sure what I am missing:

docker run -it --rm ^
--name nextcloud-easy-test1 ^
-p 8443:443 ^
-e SERVER_BRANCH=stable31 ^
-e TRUSTED_DOMAIN=nextcloud.local ^
--add-host nextcloud.local=192.168.178.167  ^
--volume="nextcloud_easy_test_npm_cache_volume:/var/www/.npm" ^
ghcr.io/szaimen/nextcloud-easy-test:latest

docker run -it --rm ^
--name nextcloud-easy-test2 ^
-p 8444:443 ^
-e SERVER_BRANCH=stable31 ^
-e TRUSTED_DOMAIN=nextcloud.local ^
--add-host nextcloud.local=192.168.178.167  ^
--volume="nextcloud_easy_test_npm_cache_volume:/var/www/.npm" ^
ghcr.io/szaimen/nextcloud-easy-test:latest

Then open https://localhost:8444/index.php/settings/admin/sharing and https://localhost:8443/index.php/settings/admin/sharing and enter https://nextcloud.local:8443/ or https://nextcloud.local:8444/ as trusted server