Include .env file in test project configuration

Add .env file to project output directory

Author: MatteoDelOmbra

Frends.Template/Frends.Echo.Execute/Frends.Echo.Execute.Tests/Frends.Echo.Execute.Tests.csproj

@@ -9,6 +9,10 @@
         <ProjectReference Include="..\Frends.Echo.Execute\Frends.Echo.Execute.csproj"/>
     </ItemGroup>
 
+    <ItemGroup>
+        <None Include=".env" CopyToOutputDirectory="PreserveNewest"/>
+    </ItemGroup>
+
     <ItemGroup>
         <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556"/>
         <PackageReference Include="coverlet.collector" Version="6.*"/>