bacalhau config set --config=config.yaml <key> <value> fails if config.yaml doesn't exist

[frrist]

Bug Description

This appears to be a regression introduced via #4466

bacalhau config set --config=config.yaml datadir /some/path
invalid argument "config.yaml" for "-c, --config" flag: the specified configuration file "config.yaml" doesn't exist

[wdbaruni]

Wasn't regression but intentional. if the user miss typed a config file name I would prefer it fails than assuming it wrote to the correct file and create a new one instead

[frrist]

I thought the behavior we wanted was to create a config file if one didn't exist? Right now, the current behavior is that config set will create a config file in the repo is one doesn't exist. But, for example re-suing the above command, bacalhau will not create the config.yaml file.