chore: ensure API key env var doesn't affect tests (#98)

### what

ensure there's no STACKLET_API_KEY set in env during tests

### why

isolate tests better

### testing

current tests

### docs

n/a

Author: albertodonato

tests/conftest.py

@@ -18,6 +18,12 @@ def requests_adapter() -> Iterator[requests_mock.Adapter]:
         yield adapter
 
 
+@pytest.fixture(autouse=True)
+def ensure_no_stacklet_api_key_env(monkeypatch) -> None:
+    """Ensure STACKLET_API_KEY doesn't come set from the env during tests."""
+    monkeypatch.delenv("STACKLET_API_KEY", raising=False)
+
+
 @pytest.fixture(autouse=True)
 def default_stacklet_dir(tmp_path_factory) -> Iterator[Path]:
     """A default .stacklet directory for testing."""