build: Move building and checking of distribution files into dedicated tox environment.

This simplifies the GitHub Actions workflow, allows future pinning of the dependencies associated with the check, and aligns development and CI setups more closely.

Author: seifertm

.github/workflows/main.yml

@@ -37,16 +37,12 @@ jobs:
       run: python -m pip install pre-commit
     - name: Run pre-commit checks
       run: pre-commit run --all-files --show-diff-on-failure
-    - name: Install check-wheel-content, and twine
-      run: python -m pip install build check-wheel-contents twine
-    - name: Build package
-      run: python -m build
+    - name: Install tox
+      run: python -m pip install tox
+    - name: Build package and check distributions
+      run: tox run -e build
     - name: List result
       run: ls -l dist
-    - name: Check wheel contents
-      run: check-wheel-contents dist/*.whl
-    - name: Check long_description
-      run: python -m twine check dist/*
     - name: Install pytest-asyncio
       run: pip install .
     - name: Get version info

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 4.28.0
-envlist = py39, py310, py311, py312, py313, py314, pytest-min, docs, pyright
+envlist = build, py39, py310, py311, py312, py313, py314, pytest-min, docs, pyright
 isolated_build = true
 passenv =
     CI
@@ -23,6 +23,15 @@ commands =
     python -c 'import shutil; shutil.rmtree("{toxinidir}{/}dist", ignore_errors=True)'
     pyproject-build --outdir {toxinidir}{/}dist .
 
+[testenv:build]
+description = Check distribution files
+deps =
+    check-wheel-contents
+    twine
+commands =
+    check-wheel-contents {toxinidir}{/}dist
+    twine check {toxinidir}{/}dist{/}*
+
 [testenv:pytest-min]
 extras = testing
 constraints = dependencies/pytest-min/constraints.txt
@@ -81,7 +90,7 @@ skip_install = true
 
 [gh-actions]
 python =
-    3.9: py39, pytest-min
+    3.9: py39, pytest-min, build
     3.10: py310
     3.11: py311
     3.12: py312