Make ignore_patterns configurable

[mrshu]

The ignore_patterns are currently hard coded in the script:

huggingface-sync-action/sync_with_spaces.py

Line 38 in 54e4f55

ignore_patterns=["*.git*", "*README.md*"],

In some specific cases, however, the user might want to update the README.md as part of the GH action as well.

Would you be open to making the ignore_patterns user-configurable so that this would be possible?

Thanks a bunch!

[nateraw]

Feel free to PR if you'd like and I'll review, else I'll have to get to this when I find time which might be a little bit.

[nateraw]

Perhaps we go ahead and do #6 at the same time. lmk if you want to take a stab at it, else I'll take a look. If the CLI from HF doesn't work well with string ignore/allow patterns, we'll keep the script here.