Local mods not detected by launch.py

[pnmcosta]

I believe that

https://github.com/BrettMayson/Arma3Server/blob/v2/launch.py#L56

is incorrect because os.path will be relative to the execution directory, which is /arma3:

https://github.com/BrettMayson/Arma3Server/blob/v2/Dockerfile#L56

I can further confirm this if I change

-v path/to/mods:/arma3/server/mods

to

-v path/to/mods:/arma3/mods

Then the mod attribute on the binary is set with the list of mods.

However as it's not relative to the binary on /arma3/server local mods aren't loading.

I also believe the same will occur with serverMods as it's the same harnessing method.

[pnmcosta]

FWIW I believe the quickest fix would be to change Docker's working directory to /arma3/server instead, but there might be other cases I'm not considering.