Update build workflow

Author: JimBobSquarePants

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

@@ -19,6 +19,10 @@ jobs:
                       framework: netcoreapp3.1
                       runtime: -x64
                       codecov: false
+                    - os: macos-latest
+                      framework: netcoreapp3.1
+                      runtime: -x64
+                      codecov: false
                     - os: windows-latest
                       framework: netcoreapp3.1
                       runtime: -x64
@@ -53,6 +57,14 @@ jobs:
                   git fetch --prune --unshallow
                   git submodule -q update --init --recursive
 
+            - name: Setup NuGet Cache
+              uses: actions/cache@v2
+              id: nuget-cache
+              with:
+                  path: ~/.nuget
+                  key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj', '**/*.props', '**/*.targets') }}
+                  restore-keys: ${{ runner.os }}-nuget-
+
             - name: Build
               shell: pwsh
               run: ./ci-build.ps1 "${{matrix.options.framework}}"
@@ -64,6 +76,13 @@ jobs:
                   CI: True
                   XUNIT_PATH: .\tests\ImageSharp.Drawing.Tests # Required for xunit
 
+            - name: Store Output Images after failed tests
+              uses: actions/upload-artifact@v2
+              if: failure()
+              with:
+                  name: actual_output_${{ runner.os }}_${{ matrix.options.framework }}${{ matrix.options.runtime }}.zip
+                  path: tests/Images/ActualOutput/
+
             - name: Update Codecov
               uses: codecov/codecov-action@v1
               if: matrix.options.codecov == true && startsWith(github.repository, 'SixLabors')

tests/Directory.Build.targets

@@ -21,6 +21,7 @@
     <PackageReference Update="BenchmarkDotNet" Version="0.12.1" />
     <PackageReference Update="Magick.NET-Q16-AnyCPU" Version="7.22.0" />
     <PackageReference Update="Moq" Version="4.14.6" />
+    <PackageReference Include="runtime.osx.10.10-x64.CoreCompat.System.Drawing" Version="5.8.64" Condition="'$(IsOSX)'=='true'" />
     <PackageReference Update="System.Drawing.Common" Version="4.7.0" />
     <PackageReference Update="GeoJSON.Net" Version="1.2.19" />
     <PackageReference Update="SkiaSharp" Version="2.80.2" />