Normalize META.yml indentation

[foolip]

When working on #2196 I noticed different indentation in different files, which made it harder to work with the files.

Could we normalize the formatting of META.yml files and enforce that formatting in the lint?

@KyleJu WDYT?

P.S. I thought there was already an issue about this but I couldn't find it. Sorry if it is nevertheless a dupe of some existing issue.

[KyleJu]

Yea I think there was issue where PRs create huge diff after the indentation changes. #2207 all the gecko updates have less indentation than the default one. Let me find a way to enforce the format in the lint

[foolip]

Oh, does the Gecko sync bot not use the API for updating metadata then?

[KyleJu]

Oh, does the Gecko sync bot not use the API for updating metadata then?

nope I think they use a separate script. I am unsure what YAML library they use, which leads to a difference in formatting

[gsnedders]

I am unsure what YAML library they use, which leads to a difference in formatting

It's PyYAML:

https://github.com/mozilla/wpt-sync/blob/9347ea9494ef03d3cf448b9cdd1760985e4c69aa/sync/wptmeta/__init__.py#L287

(cc @jgraham)

I also don't quite understand the indentation rules that the Go library is using, either… It seems to create an indent of four at the first level, and then two afterwards?