fixup arch builds

Author: davidhewitt

.github/workflows/ci.yml

@@ -688,6 +688,7 @@ jobs:
           run: |
             set -x
             curl -LsSf https://astral.sh/uv/install.sh | sh
+            source $HOME/.local/bin/env
             uv sync --group testing
             uv pip install pydantic-core --no-index --no-deps --find-links dist --force-reinstall
             uv run pytest --ignore=tests/test_docstrings.py