Update build actions

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

Updates the build actions and version generation to match ImageSharp

[codecov]

Codecov Report

Merging #23 into master will decrease coverage by 5.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage    73.3%   67.98%   -5.33%     
==========================================
  Files         177       65     -112     
  Lines       10389     4807    -5582     
  Branches     1601        0    -1601     
==========================================
- Hits         7616     3268    -4348     
+ Misses       2349     1539     -810     
+ Partials      424        0     -424

Flag	Coverage Δ
#unittests	67.98% <ø> (-5.33%)	⬇️

Impacted Files	Coverage Δ
tests/ImageSharp.Drawing.Tests/VectorAssert.cs
...son/Exceptions/ImageDimensionsMismatchException.cs
...awing.Tests/Drawing/SolidFillBlendedShapesTests.cs
...wing.Tests/Drawing/FillRadialGradientBrushTests.cs
...s/ImageSharp.Drawing.Tests/GraphicsOptionsTests.cs
...Drawing.Tests/TestUtilities/TestMemoryAllocator.cs
...wing.Tests/Drawing/FillLinearGradientBrushTests.cs
.../TestUtilities/ImageProviders/TestImageProvider.cs
...Tests/TestUtilities/ImageProviders/FileProvider.cs
...ilities/ImageProviders/BasicTestPatternProvider.cs
... and 123 more

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