ecCodes required by cfgrib for running weather-mv

[blackvvine]

Running the following command in a python 3.8 environment created with pip from main branch fails:

weather-mv rg --uris "gs://$BUCKET/download/*.nc" --output_path            "gs://$BUCKET/download-rg-$(date +%s)/" --dry-run

error:

[...]
<PATH>/venv38/lib/python3.8/site-packages/xarray/backends/cfgrib_.py:29: UserWarning: Failed to load cfgrib - most likely there is a problem accessing the ecCodes library. Try import cfgrib to get the full error message
  warnings.warn(
warning: sdist: standard file not found: should have one of README, README.rst, README.txt, README.md

full trace when importing in python shell:

(venv38-rg) friedrich@basel $ python
Python 3.8.13 (default, Aug 27 2022, 18:46:53) 
[GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cfgrib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/cfgrib/__init__.py", line 20, in <module>
    from .cfmessage import COMPUTED_KEYS
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/cfgrib/cfmessage.py", line 29, in <module>
    from . import abc, messages
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/cfgrib/messages.py", line 28, in <module>
    import eccodes  # type: ignore
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/eccodes/__init__.py", line 13, in <module>
    from .eccodes import *  # noqa
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/eccodes/eccodes.py", line 12, in <module>
    from gribapi import (
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/gribapi/__init__.py", line 13, in <module>
    from .gribapi import *  # noqa
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/gribapi/gribapi.py", line 34, in <module>
    from gribapi.errors import GribInternalError
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/gribapi/errors.py", line 16, in <module>
    from .bindings import ENC, ffi, lib
  File "<PATH>/venv38-rg/lib/python3.8/site-packages/gribapi/bindings.py", line 35, in <module>
    raise RuntimeError("Cannot find the ecCodes library")
RuntimeError: Cannot find the ecCodes library
>>> 

Adding ecmwflibs==0.4.17 to the requirements seems to resolve the issue (see here).