Create a .flyteignore to ignore additional files whilst fast-registering

[bstadlbauer]

When a user fast registers, all files which are not in .gitignore or .dockerignore will be packaged up and sent to Flyte (docs). This can lead to unexpected large tarballs and thus long registrations times when users have large files (which might not be under version control) in their project directory.
While users can all those files to .dockerignore or to .gitignore, this will always result in the expected side-effects of those tools.

[fg91]

+1 We certainly were in situations as well where people added certain files/dirs to their .gitignore/.dockerignore for Flyte's fast registration but then couldn't actually commit those changes to .gitignore/.dockerignore.

While I think it's a good idea to implement this, I don't think it requires an RFC.

[davidmirror-ops]

Thanks for bringin this up @bstadlbauer
As discussed in today's contributors meetup, this is a good idea but doesn't need an RFC.
Please transfer to an Issue and continue there.