Fixed .NET 8, set up Loki, Grafana, Promtail.

Today I'll fix the dotnet 8 issue and hopefully set up loki.

I added the dotnet 8 sdk to the image, but the real solution would probably be to migrate all projects do dotnet 9. I'll lave it for now but that's definitely something to look at in the future.

I've set up Loki, Grafana and Promtail. I can now open the prod Grafana and see logs from all of my containers. It's a mess and not very usable at the moment, so I have some fiddling to do before I can get some value from it.