cherry pick CI improvements from @JimBobSquarePants

GitVersion.yml

@@ -2,5 +2,6 @@ continuous-delivery-fallback-tag: ci
 branches:
     master:
         tag: unstable
+        mode: ContinuousDeployment
     pull-request:
         tag: pr

ci-test.ps1

@@ -34,8 +34,4 @@ elseif ($platform -eq '-x86' -and $targetFramework -match $netFxRegex) {
 else {
 
   dotnet test --no-build -c Release -f $targetFramework
-}
+}
-
-# Explicitly exit with 0 to ignore errors caused by coverlet attempting to read
-# project files that dotnet test is set to ignore.
-exit 0

src/Directory.Build.targets

@@ -50,6 +50,6 @@
 
   <!-- Empty target so that `dotnet test` will work on the solution -->
   <!-- https://github.com/Microsoft/vstest/issues/411 -->
-  <Target Name="VSTest" />
+  <Target Name="VSTest" Condition="'$(IsTestProject)' == 'true'"/>
 
 </Project>

tests/Directory.Build.props

@@ -28,6 +28,9 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" IsImplicitlyDefined="true" />
     <PackageReference Include="xunit" IsImplicitlyDefined="true" />
     <PackageReference Include="xunit.runner.visualstudio" IsImplicitlyDefined="true" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(codecov)' == 'true' AND '$(IsTestProject)' == 'true'">
     <PackageReference Include="coverlet.collector" IsImplicitlyDefined="true" />
     <PackageReference Include="coverlet.msbuild" IsImplicitlyDefined="true" />
   </ItemGroup>

tests/Directory.Build.targets

@@ -25,7 +25,7 @@
 
   <!--Code coverage specific settings-->
   <!--https://github.com/tonerdo/coverlet-->
-  <PropertyGroup Condition="'$(codecov)' == 'true'">
+  <PropertyGroup Condition="'$(codecov)' == 'true' AND '$(IsTestProject)' == 'true'">
     <CollectCoverage>true</CollectCoverage>
     <UseSourceLink>true</UseSourceLink>
     <CoverletOutputFormat>opencover</CoverletOutputFormat>

tests/ImageSharp.Tests/ImageSharp.Tests.csproj

@@ -8,6 +8,8 @@
     <AssemblyName>SixLabors.ImageSharp.Tests</AssemblyName>
     <Platforms>AnyCPU;x64;x86</Platforms>
     <RootNamespace>SixLabors.ImageSharp.Tests</RootNamespace>
+    <!--Used to show test project to dotnet test-->
+    <IsTestProject>true</IsTestProject>
   </PropertyGroup>
 
   <ItemGroup>