[rw] Add handling for steps in dir
This change adds handling for a directory with multiple steps. Each step
is a single file inserted into the tempdir set as a build property. The
code reads all the steps in the directory and then makes a single Go
slice out of it.
Bug: b/295932544
Change-Id: I1ef7c40f8e866001b908c2a1aafaf4c2432b651f
Reviewed-on: https://fuchsia-review.googlesource.com/c/infra/infra/+/925752
Reviewed-by: Nathan Mulcahey <nmulcahey@google.com>
Commit-Queue: Chris Lewis <cflewis@google.com>
4 files changed
