Use solution target to filter out samples

Author: JimBobSquarePants

.github/workflows/build-and-test.yml

@@ -74,7 +74,7 @@ jobs:
                   XUNIT_PATH: .\tests\ImageSharp.Web.Tests # Required for xunit
 
             - name: Update Codecov
-              uses: codecov/codecov-action@v1.0.7
+              uses: codecov/codecov-action@v1
               if: matrix.options.codecov == true && startsWith(github.repository, 'SixLabors')
               with:
                   flags: unittests

ImageSharp.Web.sln

@@ -7,6 +7,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "_root", "_root", "{C317F1B1
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
 		.gitignore = .gitignore
+		after.ImageSharp.Web.sln.targets = after.ImageSharp.Web.sln.targets
 		ci-build.ps1 = ci-build.ps1
 		ci-pack.ps1 = ci-pack.ps1
 		ci-test.ps1 = ci-test.ps1
@@ -133,6 +134,7 @@ Global
 		{8F40DEC6-A97F-4002-A504-13E188665A98}.Debug|x86.ActiveCfg = Debug|Any CPU
 		{8F40DEC6-A97F-4002-A504-13E188665A98}.Debug|x86.Build.0 = Debug|Any CPU
 		{8F40DEC6-A97F-4002-A504-13E188665A98}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8F40DEC6-A97F-4002-A504-13E188665A98}.Release|Any CPU.Build.0 = Release|Any CPU
 		{8F40DEC6-A97F-4002-A504-13E188665A98}.Release|x64.ActiveCfg = Release|Any CPU
 		{8F40DEC6-A97F-4002-A504-13E188665A98}.Release|x64.Build.0 = Release|Any CPU
 		{8F40DEC6-A97F-4002-A504-13E188665A98}.Release|x86.ActiveCfg = Release|Any CPU

after.ImageSharp.Web.sln.targets

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Remove the samples project from the build when running in CI.
+This prevents build issues when targeting lower, unused target frameworks.
+See https://t.co/0A4WzeGMZS
+-->
+<Project InitialTargets="RemoveSamples">
+  <Target Name="RemoveSamples">
+    <ItemGroup>
+      <ProjectReference
+        Remove="$(MSBuildThisFileDirectory)\samples\ImageSharp.Web.Sample\ImageSharp.Web.Sample.csproj"
+        Condition="'$(GITHUB_ACTIONS)' == 'true'"/>
+    </ItemGroup>
+  </Target>
+</Project>