Thanks for your reply. It looks like I might need to add some variables, but I can't find any guide/documentation on it. I've tried to set it up with ProtonVPN, but I can't figure out how to get it working. Is there any documentation on it that I have somehow missed? I feel like I'm missing something obvious.
I just download and tried to setup this container, but it doesn't seem to include any VPN functionality by itself, as was in the description: "This Docker includes OpenVPN and WireGuard to ensure a secure and private connection to the Internet". Have I just missed something obvious, or do you really need another docker to make this work with a VPN?