Hi guys, I wanted to ask question but couldn't register on IRC chat.
Question: 
I'm trying to run go-ipfs from docker image, but I don't want to do just docker pull, I'd like to modify dockerfile so it connects to my private IPFS network. Unfortunately when I copy docker file from go-ipfs docker page and try to build it, it fails at 3rd line(COPY go.mod go.sum $SRC_DIR/). running docker pull works without problem but as I said I want to modify it a bit. I thought "dockerfile" is excatly what is being executed when I run docker pull but it's not? I'd really appreciate some help here. Dockerfile that works ? 
Thanks and keep up good work IPFS team !