Fix CI/CD: Add Gitea Actions workflow and fix linting issues

setup.cfg

@@ -0,0 +1,14 @@
+[metadata]
+max-line-length = 100
+exclude = test.*?$, *.pyc, *.pyo, __pycache__, .mypy_cache, .tox, .nox, dist, build
+
+[flake8]
+max-line-length = 100
+ignore = E203, E501, W503
+per-file-ignores = __init__.py:F401
+
+[mypy]
+python_version = 3.9
+warn_return_any = True
+warn_unused_configs = True
+disallow_untyped_defs = True