@sam I can resolve host from host machine
nslookup github.com
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: github.com
Address: 192.30.255.113
Name: github.com
Address: 192.30.255.112
also I made git clone https://github.com/discourse/discourse_docker.git /var/discourse to host machine