0.3.0: pytest fails in all units with `cannot identify image file`

[kloczek]

I'm packaging your module as an rpm package so I'm using the typical PEP517 based build, install and test cycle used on building packages from non-root account.

• python3 -sBm build -w --no-isolation
• because I'm calling build with --no-isolation I'm using during all processes only locally installed modules
• install .whl file in </install/prefix> using 'installer` module
• run pytest with $PYTHONPATH pointing to sitearch and sitelib inside </install/prefix>
• build is performed in env which is cut off from access to the public network (pytest is executed with -m "not network")

List of installed modules in build env:

Package            Version
------------------ -------
build              1.0.3
cppclean           0.13
distro             1.9.0
dnf                4.18.2
exceptiongroup     1.1.3
gpg                1.23.2
importlib_metadata 7.0.1
iniconfig          2.0.0
installer          0.7.0
libdnf             0.72.0
olefile            0.47
packaging          23.2
pillow             10.2.0
pluggy             1.3.0
poetry-core        1.9.0
py-cpuinfo         9.0.0
pyproject_hooks    1.0.0
pytest             8.0.0
pytest-benchmark   4.0.0
python-dateutil    2.8.2
six                1.16.0
tomli              2.0.1
wheel              0.42.0
zipp               3.17.0

Please let me know if you need more details or want me to perform some diagnostics.