implement spell-checking in Dockerfile.test

[modernNeo]

https://github.com/pylint-dev/pylint
https://pylint.readthedocs.io/en/latest/user_guide/configuration/all-options.html#spelling-checker
https://pyenchant.github.io/pyenchant/install.html

currently blocked by:

To detect the libenchant binaries, PyEnchant uses [ctypes.util.find_library()]  
(https://docs.python.org/3/library/ctypes.html#finding-shared-libraries), which requires ldconfig, gcc, objdump or ld to be installed.  
This is the case on most major distributions, however statically  
linked distributions (like Alpine Linux) might not bring along binutils by default.

• ImportError: The 'enchant' C library was not found. Please install it via your OS package manager, or use a pre-built binary wheel from PyPI. pyenchant/pyenchant#164
• find_library broken in alpine image docker-library/python#111
• ctypes.util incorrectly fails for libraries without DT_SONAME python/cpython#65821
• gh-65821: Fix ctypes.util.find_library with musl python/cpython#18380