Allow arbitrary file for script_dirs

[Haegi]

Motivation

At the moment it is only possible to import local .sh and .py files via the script_dirs argument due to this condition.
It would be great to be able to import any local file or at least .yaml files for ytt.

Ideas

• Add a argument called file_types to the Pipeline class
• Add .yaml to the condition
• Accept every file (but I don't think that this is the right way)

[Haegi]

@phil9909 @loewenstein @c0d1ngm0nk3y WDYT?

[phil9909]

Add a argument called file_types to the Pipeline class

+1

[loewenstein]

file_types would be independent from script_dirs? Sounds strange. What about changing to scripts and supporting globs?

[c0d1ngm0nk3y]

Add a argument called file_types to the Pipeline class

+1

I think I got it now. So [".sh", ".py"] could be the default.

+1

[c0d1ngm0nk3y]

file_types would be independent from script_dirs?

But I think it is unlikely that we need different file_types for each script_dir, right?

[Haegi]

The approach of @c0d1ngm0nk3y looks quite good.
However, I like the globbing approach much more and I opened #17 to get a first idea of how it could be done.