go-neb isn't functional on linux

[ashfame]

After providing the access token created for the bot user to go-neb via a http api call, and enabling the echo service, the bot doesn't react upon inviting to a room.

Logs show that go-neb tries to connect to synapse container for sync, but that connection attempt is refused. go-neb was able to ping the synapse container from its container though:

docker exec -it go-neb-container-id /bin/sh
ping matrix-env-synapse

This issue is specific to linux (tried on Arch linux) and works without an issue on MacOS.