Clear nuget locals before build

.github/workflows/build.yml

@@ -34,6 +34,8 @@ jobs:
         with:
           # As usual, obtained from: https://dotnetcli.blob.core.windows.net/dotnet/release-metadata/5.0/releases.json
           dotnet-version: "3.1.404" # since we now use this
+      - name: Clean
+        run: dotnet nuget locals all --clear
       - name: Restore
         run: msbuild -t:Restore -m
       - name: Build
@@ -47,4 +49,4 @@ jobs:
         uses: actions/upload-artifact@v2
         with:
           name: BSIPA-net35-${{ env.Platform }}
-          path: BSIPA-Meta/bin/${{ env.Platform }}/${{ env.Configuration }}/net35/
+          path: BSIPA-Meta/bin/${{ env.Platform }}/${{ env.Configuration }}/net35/