Throw on invalid .pgsync.yml

[Garrett-R]

It would be nice if pgsync threw when .pgsync.yml was invalid. While QAing on temporary DBs, an LLM just hallucinated that tables was a config option (made feature request in #210 BTW).

pgsync happily ran despite an unrecognized config. Indeed you can add this to your config:

foo:
  - bar

and it'll still run. I think it's more conventional and safer for tools not to run if there's hogwash in the config.

[ankane]

Hi @Garrett-R, thanks for the suggestion. However, this would affect YAML aliases.

[Garrett-R]

Ah good to know!

It does seem though that, at least in theory, this package should be able to consume one of its config files and answer the question "is this a valid config file?" even while supporting YAML aliases. No idea how challenging that would be though.