Getting an erro

not sure if I was supposed to connect it to my own sql database or if that is also part of the image… my domain resolves fine - this is the command I used:

docker run --net=matrix --name matrix-yourls --link some-mysql:mysql \
    -e YOURLS_SITE="https://a.chagai.website" \
    -e YOURLS_USER="chagai" \
    -e YOURLS_PASS="chagai95" \
    -d yourls
Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in Standard input code on line 17

Warning: mysqli::__construct(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in Standard input code on line 17

MySQL Connection Error: (2002) php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution