glue_cli_tests multithreading bug

[Anton-4]

$ nix develop -c cargo test --locked --release glue_cli_tests
...
 running 18 tests
test glue_cli_tests::all_fixtures_have_tests ... ignored
test glue_cli_tests::c_hello_world ... ok
test glue_cli_tests::rust_advanced_recursive_union ... ok
test glue_cli_tests::rust_closures ... ok
test glue_cli_tests::rust_basic_record ... ok
test glue_cli_tests::rust_basic_recursive_union ... ok
test glue_cli_tests::rust_enumeration ... ok
test glue_cli_tests::rust_nested_record ... ok
test glue_cli_tests::rust_list_recursive_union ... ok
test glue_cli_tests::rust_nonnullable_unwrapped ... ok
test glue_cli_tests::rust_nullable_unwrapped ... ok
test glue_cli_tests::rust_nullable_wrapped ... ok
test glue_cli_tests::rust_option ... ok
test glue_cli_tests::rust_rocresult ... ok
test glue_cli_tests::rust_single_tag_union ... ok
test glue_cli_tests::rust_union_with_padding ... ok
test glue_cli_tests::rust_union_without_padding ... ok
test glue_cli_tests::rust_multiple_modules has been running for over 60 seconds

Workarounds are in place in nix_linux_x86_64 and ubuntu_x86_64_nix_debug.yml, I've not seen it without nix or on macos.