Cross-export Windows release package on Linux

tools/build-linux-x64.sh

@@ -94,6 +94,7 @@ AGE_PUBLISH_PROJECT="$project_root/Himegari.csproj" \
 AGE_PREPUBLISHED_OUTPUT="$managed_proxy_directory" \
 AGE_PUBLISH_OUTPUT_ROOT="${TMPDIR:-/tmp}/godot-publish-dotnet" \
 AGE_PUBLISH_ASSEMBLY="Himegari.dll" \
+AGE_PUBLISH_RUNTIME="linux-x64" \
 PATH="$dotnet_proxy_directory:$PATH" \
 XDG_DATA_HOME="$xdg_data_home" "$godot_console" \
     --headless --quit-after 120 --path "$project_root" \