override dist taskfile

[lrob]

If not already possible, and I missed it, it would be very useful to be able to override only certain fields of a taskfile.dist.yml with a local taskfile.yml. Just like in docker compose with docker-compose.override.yml. Here is the documentation for it.

This would have several advantages: the most important, I think, are:

1. The taskfile.yml would usually be very short, because the fields to be overridden are usually only a few.
2. if any part of the dist file is modified, this is automatically inherited by the local taskfile.yml.