Prevent on-diff getdeps jobs from running when files in fboss/oss change

Summary: The files in `fboss/oss` are mainly just config files, docker files, and other things that our on diff jobs don't test anyway. By preventing them from running on changes made in this directory, we can save hours of test time on each relevant diff, as the on-diff jobs always have to wait in long queues.

Reviewed By: joseph5wu

Differential Revision: D81816095

fbshipit-source-id: d3c7e9dee96328c9364e69bc9111c610890fd7f2

Author: KevinYakar

build/fbcode_builder/manifests/fboss

@@ -51,6 +51,7 @@ fbcode/fboss = fboss
 
 [shipit.strip]
 ^fbcode/fboss/github/docs/.*
+^fbcode/fboss/oss/.*
 
 [sandcastle]
 run_tests = off