ci: run cargo test

.github/workflows/on_push.yml

@@ -72,6 +72,7 @@ jobs:
           git config --global init.defaultBranch main
           export PY_V=py3`python -c "import sys; print(sys.version_info.minor, end='')"`
           tox -c tosca-parser/tox.ini -v -e $PY_V
+          cargo test --no-default-features --manifest-path rust/Cargo.toml
           tox -e $PY_V -v -- -vv -n auto --dist loadfile
           .tox/$PY_V/bin/mypy unfurl --install-types --non-interactive
       - name: build docs