housekeeping: Clean NuGet Locals before CI Build (#190)

* housekeeping: Clean NuGet Locals before CI Build

* Run samples CI when GitHub Actions config changes

* Fix step order

* Add missing properties

* Try without maxcpucount

.github/workflows/build-samples.yml

@@ -5,10 +5,12 @@ on:
     branches: [ main ]
     paths:
       - 'samples/**'
+      - '.github/**'
   pull_request:
     branches: [ main ]
     paths:
       - 'samples/**'
+      - '.github/**'
 
 jobs:
   build-samples:
@@ -40,8 +42,15 @@ jobs:
     - name: Setup MSBuild.exe
       uses: microsoft/setup-msbuild@v1.0.2
 
+    # The workaround from https://github.com/actions/setup-dotnet/issues/155#issuecomment-748452076
+    - name: Clean
+      run: msbuild LoginApp.sln /t:clean /p:NoPackageAnalysis=true /verbosity:minimal /p:Configuration=$env:Configuration && dotnet nuget locals all --clear
+      working-directory: samples
+      env:
+        Configuration: ${{ matrix.configuration }}
+
     - name: Restore/Build the sample
       run: msbuild LoginApp.sln /t:restore,build /maxcpucount /p:NoPackageAnalysis=true /verbosity:minimal /p:Configuration=$env:Configuration
       working-directory: samples
       env:
-        Configuration: ${{ matrix.configuration }}
+        Configuration: ${{ matrix.configuration }}