owncast: Quickstart fails, `valid config/config.yaml is required` (and other mattdsteele questions)

Ran through the Dockerized setup in the quickstart, and I was able to successfully build the container, but starting it I’m encountering this error:

root@ubuntu-s-1vcpu-1gb-sfo2-01:~/owncast# docker run -p 8080:8080 -p 1935:1935 -it owncast
INFO[2020-07-12T19:20:21Z] Owncast v0.0.0-localdev (unknown)
FATA[2020-07-12T19:20:21Z] ERROR: valid config/config.yaml is required.  Copy config-example.yaml to config.yaml and edit

I copied the sample config into config/config.yaml before building the container:

root@ubuntu-s-1vcpu-1gb-sfo2-01:~/owncast# ls -l config
total 16
-rw-r--r-- 1 root root 4941 Jul 12 19:10 config.go
-rw-r--r-- 1 root root 1441 Jul 12 19:18 config.yaml
-rw-r--r-- 1 root root  842 Jul 12 19:10 configUtils.go

The only line I changed was updating streamingKey to a different value. I also tried copying config-example.yaml directly, and that also failed.

I’ll try the non-Docker approach next, but would definitely like to have this running in a container as an option!

For context, this is a stock DigitalOcean VPS running Ubuntu 20.04