Permission denied error when starting docker container

Hello. I cloned to a directory and ran the two build/run commands below. 

I'm running Ubuntu 18.04 and Docker 20.10.17. Let me know what other info I can provide. Thanks!

```
ryan@docker:~/snippin$ sudo docker run -it -p 8300:80 snipp/snipp.in .
/docker-entrypoint.sh: exec: line 38: .: Permission denied
```