fixes: python -m build fails (#14)

Author: arenevier

.github/workflows/main.yml

@@ -21,6 +21,10 @@ jobs:
             toxenv: pillow8.x
           - python-version: '3.11'
             toxenv: pillow9.x
+          - python-version: '3.11'
+            toxenv: sdist
+          - python-version: '3.11'
+            toxenv: wheel
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
@@ -34,4 +38,4 @@ jobs:
       - name: Run tox
         env:
           TOXENV: ${{ matrix.toxenv }}
-        run: tox -- -v
+        run: tox -- -v

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "docutils"]
+build-backend = "setuptools.build_meta"

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py{310,311},pillow{8.x,9.x},flake8
+envlist=py{310,311},pillow{8.x,9.x},flake8,sdist,wheel
 
 [testenv]
 usedevelop = True
@@ -16,6 +16,16 @@ passenv =
 commands =
     pytest
 
+[testenv:sdist]
+description = Build a source distribution
+deps = build
+commands = python -m build --sdist
+
+[testenv:wheel]
+description = Build a binary distribution
+deps = build
+commands = python -m build --wheel
+
 [testenv:flake8]
 description =
     Run style checks.