Revert "refactor: attempt to modernise build"

This reverts commit 54252c8 and
restores compatibility with Fedora 36, EL 9, and other distributions
with older setuptools versions.

- Keep the setup.py out. The setuptools PEP 517 backend can read
  configuration from setup.cfg.
- Relax setuptools constraint. The newer version is only needed for PEP
  631 support.
- Relax setuptools_scm constraint. The upstream recommendation is
  arbitrary and older versions still work. EL 9 only has 6.0.1.
- Leave setuptools_scm configuration in pyproject.toml.

pyproject.toml

@@ -1,58 +1,3 @@
-[project]
-name = "ansible-bender"
-authors = [
-  {name = "Tomas Tomecek", email = "[email protected]"},
-]
-description = "A tool which builds container images using Ansible playbooks"
-readme = "README.md"
-requires-python = ">= 3.6"
-keywords = [
-  "ansible",
-  "containers",
-  "linux",
-  "buildah",
-]
-license = {text = "MIT"}
-classifiers = [
-    "Development Status :: 5 - Production/Stable",
-    "Environment :: Console",
-    "Intended Audience :: Developers",
-    "License :: OSI Approved :: MIT License",
-    "Operating System :: POSIX :: Linux",
-    "Programming Language :: Python",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
-    "Topic :: Software Development",
-    "Topic :: Utilities",
-]
-dependencies = [
-    "PyYAML",
-    "tabulate",
-    "jsonschema",
-    "setuptools",
-    # https://peps.python.org/pep-0631/
-    "importlib_metadata; python_version < '3.8'",
-]
-dynamic = ["version"]
-
-[project.urls]
-homepage = "https://github.com/ansible-community/ansible-bender"
-documentation = "https://ansible-community.github.io/ansible-bender/build/html/index.html"
-
-[project.optional-dependencies]
-testing = [
-  "pytest",
-  "flexmock",
-  "pytest-cov",
-]
-
-[project.scripts]
-ansible-bender = "ansible_bender.cli:main"
-
 # reference for usage:
 # https://github.com/pypa/setuptools_scm/#pyprojecttoml-usage
 [tool.setuptools_scm]
@@ -61,5 +6,5 @@ ansible-bender = "ansible_bender.cli:main"
 # setuptools: https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html
 # setuptools-scm: https://github.com/pypa/setuptools_scm/#pyprojecttoml-usage
 [build-system]
-requires = ["setuptools>=61", "setuptools-scm[toml]>=6.2"]
+requires = ["setuptools", "setuptools-scm[toml]"]
 build-backend = "setuptools.build_meta"

setup.cfg

@@ -1,8 +1,61 @@
+[bdist_wheel]
+universal = 1
+
+[metadata]
+name = ansible-bender
+url = https://github.com/ansible-community/ansible-bender
+description = A tool which builds container images using Ansible playbooks
+long_description = file: README.md
+long_description_content_type = text/markdown
+author = Tomas Tomecek
+author_email = [email protected]
+license = MIT
+license_file = LICENSE
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Environment :: Console
+    Intended Audience :: Developers
+    License :: OSI Approved :: MIT License
+    Operating System :: POSIX :: Linux
+    Programming Language :: Python
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
+    Topic :: Software Development
+    Topic :: Utilities
+keywords =
+    ansible
+    containers
+    linux
+    buildah
+
+
 [options]
+python_requires = >=3.6
 packages = find:
 include_package_data = True
 
+install_requires =
+    PyYAML
+    tabulate
+    jsonschema
+    setuptools
+    importlib_metadata; python_version < '3.8'
+
 [options.packages.find]
 exclude =
     tests
     tests.*
+
+[options.extras_require]
+testing =
+    pytest
+    flexmock
+    pytest-cov
+
+[options.entry_points]
+console_scripts =
+    ansible-bender = ansible_bender.cli:main