Bridge to local network via Synology docker container

I am a newbie to Zerotier but first steps were quick and successful. Nice experience.
But first extra wish overwhelms me.

I want to build a bridge into my local network and found https://zerotier.atlassian.net/wiki/spaces/SD/pages/193134593/Bridge+your+ZeroTier+and+local+network+with+a+RaspberryPi

I like to do nearly the same but instead of a PI I want to use my Docker container which I have running on my Synology NAS. Image is zerotier/zerotier-synology:latest.
It is member of the Zerotier network and responding.

The instructions above include apt which does not exist in the container. How can I achieve the configuration then?
(I am not a network specialist.)

Happy Easter (in two days)!
//Jens

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