Previously config files next to an explicit input file could not be picked up, since the from_root_or_default functions assumes the input path is a directory.
This is the case for all other usages of the function, but in this case we know the input is a file, so we should determine the parent directory and look for the config file in that directory. There can't be a folder with the same name as the input file, so it's not possible that we won't pick up any files anymore that we previously did.
Previously config files next to an explicit input file could not be picked up, since the
from_root_or_defaultfunctions assumes the input path is a directory. This is the case for all other usages of the function, but in this case we know the input is a file, so we should determine the parent directory and look for the config file in that directory. There can't be a folder with the same name as the input file, so it's not possible that we won't pick up any files anymore that we previously did.