Add some notion of embedded resource/file that gets installed with a workflow

[dsyme]

We should probably add embedded-resource: declarations or the like to say "if this gets installed, it goes with the workflow"

installed-resource: 
   - ./scripts/my-python-script
   - ./some-directory

It's not actually "embedded" into a binary so suggesting "installed-resource"

Ideas

• They could only be workflow-relative.
• We would of course need to consider where they get installed.

[pelikhan]

We have the manifest in the generated .lock.yml:

# Resolved workflow manifest:
#   Imports:
#     - license-check.yml
#