replace placeholder URLS with commandline variables

[OAburub]

I reported this issue here #85 , this PR should fix it

[Faraz32123]

Hello @OAburub, can u also create a changelog entry(like this) by using scriv(scriv create).

[regisb]

I don't understand this change. The lms-url and studio-url are supposed to be the internal URL used for communication between containers, right?

[OAburub]

@regisb If that is the case, then I severely misunderstood the code, and therefore the error/issue (#86) that made me open this PR.
I assumed that "https://lms:8000" was simply a placeholder that may have been forgotten about, not an internal URL pointing to a container, but it appears that it was being pointed correctly and the error was produced because another part of the platform had not been initialized correctly.

I'm awaiting confirmation on this if possible, then I will close the PR.

[regisb]

No worries. I think you misunderstood the code. The "lms:8000" hostnames are definitely not placeholders. It might be that we need to pass public URLs to the initialization scripts, in which case we would be very wrong, but so far this code has worked, so I'm inclined to think that if there is an issue, then the solution lies elsewhere.

[OAburub]

Alright, I will close this and the issue as well.