I've done a small amount of investigation and settled on this as my
favorite gitignore source filter function out of the several that are
available.
Change-Id: Idf1f2f643acc7f8e44de6c0c8702b16e0d37face
Reviewed-on: https://cl.tvl.fyi/c/depot/+/762
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
