Add pypi publish pixi task

pixi.toml

@@ -18,6 +18,7 @@ pre-commit = "pre-commit run --all-files"
 test = { depends_on = ["install"], cmd = "NUMBA_DISABLE_JIT=1 pytest --cov=xugrid --cov-report xml --cov-report term"}
 docs = { depends_on = ["install"], cmd = "NUMBA_DISABLE_JIT=1 sphinx-build docs docs/_build"}
 all = { depends_on = ["pre-commit", "test", "docs"]}
+pypi-publish = { cmd = "rm --recursive --force dist && python -m build && twine check dist/* && twine upload dist/*" }
 
 [dependencies]
 dask = "*"
@@ -43,3 +44,4 @@ sphinx-gallery = "*"
 xarray = "*"
 zarr = "*"
 ipykernel = "6.26.0.*"  # So we can run examples
+twine = "*"