multiple targets for TestRunner

Author: dadhi

.github/workflows/build.yml

@@ -35,6 +35,12 @@ jobs:
       - name: Tests - net9.0 (Latest)
         run: dotnet run --no-build -c:Release -f:net9.0 --project test/FastExpressionCompiler.TestsRunner/FastExpressionCompiler.TestsRunner.csproj
 
+      - name: Tests - net8.0 (Latest LTS)
+        run: dotnet run --no-build -c:Release -f:net8.0 --project test/FastExpressionCompiler.TestsRunner/FastExpressionCompiler.TestsRunner.csproj
+
+      - name: Tests - net6.0 (Previous LTS)
+        run: dotnet run --no-build -c:Release -f:net6.0 --project test/FastExpressionCompiler.TestsRunner/FastExpressionCompiler.TestsRunner.csproj
+
       - if: matrix.os == 'windows-latest'
         name: Tests - net472 (Windows only)
         run: dotnet run --no-build -c:Release --project test/FastExpressionCompiler.TestsRunner.Net472

test/FastExpressionCompiler.TestsRunner/FastExpressionCompiler.TestsRunner.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFrameworks>$(LatestSupportedNet)</TargetFrameworks>
+        <TargetFrameworks>net9.0;net8.0;net6.0</TargetFrameworks>
 
         <OutputType>Exe</OutputType>
         <IsTestProject>false</IsTestProject>