fix so when running in github actions it doesn't fail on unbuntu

Author: kevmoens

Ellabit/Ellabit.csproj

@@ -101,8 +101,15 @@
 			Lines="@(FrameworkDlls->'{ "Name": "%(Filename)", "File": "%(Filename)%(Extension)" }')"
 			Overwrite="true" />
 
-		<!-- Optional: wrap lines in an array -->
-		<Exec Command="powershell -Command &quot;$json = Get-Content '$(MSBuildProjectDirectory)\framework_manifest.json' -Raw; Set-Content '$(MSBuildProjectDirectory)\framework_manifest.json' ('[' + ($json -replace '(\r?\n)',' , ') + ']')&quot;" />
+
+		<!-- Windows version -->
+		<Exec Condition="'$(OS)' == 'Windows_NT'" 
+			  Command="powershell -Command &quot;$json = Get-Content '$(MSBuildProjectDirectory)\framework_manifest.json' -Raw; Set-Content '$(MSBuildProjectDirectory)\framework_manifest.json' ('[' + ($json -replace '(\r?\n)',' , ') + ']')&quot;" />
+		
+		<!-- Linux / macOS version -->
+		<Exec Condition="'$(OS)' != 'Windows_NT'"
+			  Command='bash -c "frameworkDir=$(PublishDir)/wwwroot/_framework; echo [ > $frameworkDir/framework_manifest.json; first=true; for dll in $frameworkDir/*.dll; do if [ $first = true ]; then first=false; else echo , >> $frameworkDir/framework_manifest.json; fi; filename=$(basename $dll); name=${filename%%.*}; echo { \\"Name\\": \\"$name\\", \\"File\\": \\"$filename\\" } >> $frameworkDir/framework_manifest.json; done; echo ] >> $frameworkDir/framework_manifest.json"' />
+
 	</Target>
 	<ItemGroup>
 		<EmbeddedResource Include="framework_manifest.json" />