Option to output processed finall taskfile yaml

[hans-d]

Description

Taskfile can work with imports. To get a full understanding of the resulting structure - the one that is being used by taskfile when executing - it would be nice to be able to save the final version of the taksfile as well.

Besides helping the full structure, in a more automated environment, we can use this final file as well to to do further processing. This could even be: if there is change (hash eg), do something additional. Eg in our case we run some dry run tests in github actions to validate the resulting tasks.

[pd93]

I can understand how this could be useful. However, there are a couple of things to note here:

• Task doesn't currently have any code to construct a Taskfile from an AST (We have unmarshalers, but no marshalers). This isn't necessarily hard to add, but Task has a lot of custom logic in its unmarshalers (fields that can be multiple types etc). I'd want lots of tests to ensure that things get marshaled the right way. Another potential use for marshalers is for a format command.
• We plan to remove Taskfile merging in the future. There are many performance and scoping related issues around merging and in the long term we plan to remove it in favor of directly traversing the DAG when running tasks. Once this work is complete, there will be no "final version" of the Taskfile, just the source files. For this reason I don't think we are likely to complete this work.