Pendulum can not find timezone on Alpine docker, resulting in `.now()` being broken

[jonaslb]

• [ x ] I am on the latest Pendulum version.
  • Tested on both latest stable and the 3.0.0a1 release
• [ x ] I have searched the issues of this repo and believe that this is not a duplicate.

• OS version and name: Docker image alpine:3.18, apk add python3 py3-pip && pip install pendulum
• Pendulum version: Tested with both 2.1.2 and 3.0.0a1

Issue

On the alpine image, pendulum cannot find the local timezone. Thus import pendulum; pendulum.now() gives the exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.11/site-packages/pendulum/__init__.py", line 206, in now
    return DateTime.now(tz)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pendulum/datetime.py", line 137, in now
    dt = datetime.datetime.now(local_timezone())
                               ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pendulum/tz/__init__.py", line 66, in local_timezone
    return get_local_timezone()
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pendulum/tz/local_timezone.py", line 33, in get_local_timezone
    tz = _get_system_timezone()
         ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pendulum/tz/local_timezone.py", line 61, in _get_system_timezone
    return _get_unix_timezone()
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pendulum/tz/local_timezone.py", line 244, in _get_unix_timezone
    raise RuntimeError("Unable to find any timezone configuration")
RuntimeError: Unable to find any timezone configuration

Curiously, this stdlib approach works totally fine: from datetime import UTC, datetime; datetime.now(UTC).astimezone().tzinfo (gives UTC, as expected).

I saw that there was a fairly recent change to have pendulum timezone depend on stdlib. Perhaps that should be expanded to use the above approach to obtaining tzinfo as well - most likely more reliable?

[tedmiston]

I'm getting this one too.

Going to just go off of Alpine for now as a workaround. ¯\_(ツ)_/¯