fix: Skip Android target on CI Linux for MAUI sample

The Android SDK has a Mono.Cecil XARRA7028 bug where
RemoveRegisterAttribute cannot find System.Runtime v10.0.0.0
when building net10.0-android Exe projects on CI Linux runners.

On CI Linux, fall back to net10.0 (library build) so the code
still compiles and is validated. Locally and on CI Windows/macOS,
the full platform TFMs are used including net10.0-android.

Author: glennawatson

src/examples/ReactiveUI.Samples.Maui/ReactiveUI.Samples.Maui.csproj

@@ -1,10 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net10.0-android</TargetFrameworks>
+    <!-- Skip Android on CI Linux due to Android SDK Mono.Cecil XARRA7028 bug with System.Runtime v10.0.0.0.
+         Remove the GITHUB_ACTIONS/Linux condition once the Android SDK ships a fix. -->
+    <TargetFrameworks Condition="'$(GITHUB_ACTIONS)' == 'true' and $([MSBuild]::IsOSPlatform('linux'))">net10.0</TargetFrameworks>
+    <TargetFrameworks Condition="'$(GITHUB_ACTIONS)' != 'true' or !$([MSBuild]::IsOSPlatform('linux'))">net10.0-android</TargetFrameworks>
     <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows')) or $([MSBuild]::IsOSPlatform('osx'))">$(TargetFrameworks);net10.0-ios;net10.0-maccatalyst</TargetFrameworks>
     <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net10.0-windows10.0.19041.0</TargetFrameworks>
-    <OutputType>Exe</OutputType>
+    <OutputType Condition="'$(TargetFramework)' != 'net10.0'">Exe</OutputType>
     <UseMaui>true</UseMaui>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>