Use lockfile to restore packages

Author: ErikSchierboom

.github/workflows/ci.yml

@@ -23,8 +23,9 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@3951f0dfe7a07e2313ec93c75700083e2005cbab
         with:
-          dotnet-version: 5.0.202
+          dotnet-version: "5.0.202"
           cache: true
+          cache-dependency-path: "**/packages.lock.json"
 
       - name: Restore packages
         run: dotnet restore --locked-mode

src/Exercism.Tests/Exercism.Tests.csproj

@@ -2,6 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>net5.0</TargetFramework>
+    <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
     <PackageId>Exercism.Tests</PackageId>
     <Version>0.1.0-beta1</Version>
     <Title>Exercism Testing</Title>