Run only .NET Core targets on Ubuntu

Author: jozefizso

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-22.04, windows-2022 ]
+        os: [ ubuntu-24.04, windows-2022 ]
         configuration: [ 'Debug', 'Release' ]
 
     runs-on: ${{ matrix.os }}
@@ -51,6 +51,8 @@ jobs:
 
     - name: test
       run: dotnet test --no-build --no-restore
+      env:
+        TestNetCoreOnly: ${{ contains(matrix.os, 'ubuntu') }}
 
     - name: pack
       run: dotnet pack --no-build --no-restore -c ${{ matrix.configuration }} -o dist

src/Directory.Build.props

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <VersionPrefix>1.0.0</VersionPrefix>
     <TargetFrameworks>net462;net48;net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(TestNetCoreOnly)' == 'true' ">net6.0;net7.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup>