[Infra] Commits should exclude .build/ folder from nested dirs (#10180)

Author: ncooke3

.gitignore

@@ -60,7 +60,7 @@ DerivedData
 
 # Swift Package Manager
 Package.resolved
-*/.build
+**/.build
 ReleaseTooling/.swiftpm
 ReleaseTooling/Packages
 ReleaseTooling/*.xcodeproj