Add cache-dependency-path for NuGet lock files

The setup-dotnet action looks for packages.lock.json in the repo root
by default. Point it at the per-project lock files with a glob.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: benaadams

.github/workflows/ci.yml

@@ -28,6 +28,7 @@ jobs:
         with:
           dotnet-version: '10.0.102'
           cache: true
+          cache-dependency-path: '**/packages.lock.json'
 
       - name: Restore dependencies
         run: dotnet restore