ci: multi-python version docker image for GHA matrix

[nosahama]

About this change - What it does

Now with the tests running in docker, we add the support to run with multiple python version provided by the github actions matrix.

Note

I suspect that we will have issues with python3.9, a local stacktrace of a startup error faced on python3.9 can be seen below:

ImportError while loading conftest '/opt/karapace/tests/conftest.py'.
tests/conftest.py:6: in <module>
    from karapace.container import KarapaceContainer
src/karapace/container.py:7: in <module>
    from karapace.auth import get_authorizer, HTTPAuthorizer, NoAuthAndAuthz
src/karapace/auth.py:11: in <module>
    from karapace.config import Config, InvalidConfiguration
src/karapace/config.py:30: in <module>
    class Config(BaseSettings):
venv/lib/python3.9/site-packages/pydantic/_internal/_model_construction.py:221: in __new__
    set_model_fields(cls, bases, config_wrapper, ns_resolver)
venv/lib/python3.9/site-packages/pydantic/_internal/_model_construction.py:593: in set_model_fields
    fields, class_vars = collect_model_fields(cls, bases, config_wrapper, ns_resolver, typevars_map=typevars_map)
venv/lib/python3.9/site-packages/pydantic/_internal/_fields.py:112: in collect_model_fields
    type_hints = _typing_extra.get_model_type_hints(cls, ns_resolver=ns_resolver)
venv/lib/python3.9/site-packages/pydantic/_internal/_typing_extra.py:509: in get_model_type_hints
    hints[name] = try_eval_type(value, globalns, localns)
venv/lib/python3.9/site-packages/pydantic/_internal/_typing_extra.py:558: in try_eval_type
    return eval_type_backport(value, globalns, localns), True
venv/lib/python3.9/site-packages/pydantic/_internal/_typing_extra.py:609: in eval_type_backport
    return _eval_type_backport(value, globalns, localns, type_params)
venv/lib/python3.9/site-packages/pydantic/_internal/_typing_extra.py:641: in _eval_type_backport
    raise TypeError(
E   TypeError: Unable to evaluate type annotation 'str | None'. If you are making use of the new typing syntax (unions using `|` since Python 3.10 or builtins subscripting since Python 3.9), you should either replace the use of new syntax with the existing `typing` constructs or install the `eval_type_backport` package.

Even with the eval_type_backport library installed, other things started to fail and also the integration tests started to fail.
Let's monitor the CI and see what comes up.

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/karapace
schema_reader.py
src/karapace/kafka
consumer.py
Project Total

This report was generated by python-coverage-comment-action