Set the coverage directory at the root of the repository

Author: 0xced

tests/Serilog.Formatting.Log4Net.Tests.csproj

@@ -25,7 +25,7 @@
     <!-- Automatically collect coverage when running `dotnet test` -->
     <CollectCoverage>true</CollectCoverage>
     <!-- Tweak the default coverlet output directory to be `coverage` inside the `tests` directory -->
-    <CoverletOutput>$([MSBuild]::EnsureTrailingSlash($([System.IO.Path]::Combine($(MSBuildProjectDirectory),'coverage'))))</CoverletOutput>
+    <CoverletOutput>$([MSBuild]::EnsureTrailingSlash($([System.IO.Path]::GetFullPath($([System.IO.Path]::Combine($(MSBuildProjectDirectory),'..','coverage'))))))</CoverletOutput>
     <!-- The default output format is `json` which is not supported by ReportGenerator -->
     <CoverletOutputFormat>cobertura</CoverletOutputFormat>
   </PropertyGroup>