Using uv 0.7.8, each invocation of

uv sync --all-packages

installs localpackage. This stops if localpackage is moved from dev dependencies to ordinary dependencies in pyproject.toml. Strangely, it also stops if the name in pyproject.toml is changes to for example "what". I have not been able to discern a pattern in which names cause the behavior and which do not, beyond that it seems to only depends on the first letter of the name.

make build run_docker_image

Then in the shell of the docker image, uv sync --all-packages.