`viur update requirements` fails in a non-pip-environment

[phorward]

I'm trying uv as a replacement for pipenv. It works nice so far, but uv run viur update requirements fails, and it also seems that this command heavily relies of a pipenv-based environment.

$ uv run viur update requirements
requirements.txt successfully generated
Traceback (most recent call last):
  File "~/myproject/.venv/bin/viur", line 10, in <module>
    sys.exit(cli())
             ~~~^^
  File "~/myproject/.venv/lib/python3.13/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "~/myproject/.venv/lib/python3.13/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
  File "~/myproject/.venv/lib/python3.13/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "~/myproject/.venv/lib/python3.13/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "~/myproject/.venv/lib/python3.13/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
  File "~/myproject/.venv/lib/python3.13/site-packages/viur_cli/update.py", line 28, in update
    create_req(True, profile)
    ~~~~~~~~~~^^^^^^^^^^^^^^^
  File "~/myproject/.venv/lib/python3.13/site-packages/viur_cli/update.py", line 70, in create_req
    if check_req(f"{dist_folder}/requirements.txt"):
       ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "~/myproject/.venv/lib/python3.13/site-packages/viur_cli/update.py", line 90, in check_req
    from pip._internal.req import parse_requirements
ModuleNotFoundError: No module named 'pip'

[phorward]

Ok now even when pip is added as a dev-dependency, but no Pipfile is available, the process also fails:

$ uv run viur update requirements
Traceback (most recent call last):
  File "~/myproject/.venv/bin/pipfile2req", line 10, in <module>
    sys.exit(main())
             ~~~~^^
  File "~/myproject/.venv/lib/python3.13/site-packages/pipfile2req/__init__.py", line 112, in main
    lines = convert_pipfile_or_lock(
        args.project, args.file, args.hashes, args.dev, args.sources
    )
  File "~/myproject/.venv/lib/python3.13/site-packages/pipfile2req/__init__.py", line 80, in convert_pipfile_or_lock
    raise FileNotFoundError("No Pipfile* is found.")
FileNotFoundError: No Pipfile* is found.
requirements.txt successfully generated