add OSPlatform Linux

Author: vilinski

src/chdb/chdb.csproj

@@ -8,6 +8,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <None Update="libchdb.so" CopyToOutputDirectory="PreserveNewest" Condition="$([MSBuild]::IsOSPlatform('OSX'))" />
+    <None Update="libchdb.so" CopyToOutputDirectory="PreserveNewest" Condition="$([MSBuild]::IsOSPlatform('OSX')) OR $([MSBuild]::IsOSPlatform('Linux'))" />
   </ItemGroup>
 </Project>