Add musllinux wheels

Signed-off-by: Adam Lugowski <alugowski@gmail.com>

pyproject.toml

@@ -202,7 +202,7 @@ spaces_indent_inline_array = 4
 trailing_comma_inline_array = true
 
 [tool.cibuildwheel]
-skip = ["*-musllinux*", "pp*"]
+skip = ["pp*"]
 test-command = [
     "env PYTHONWARNINGS=always PYTHONUNBUFFERED=1 PSUTIL_DEBUG=1 PSUTIL_SCRIPTS_DIR={project}/scripts python {project}/psutil/tests/runner.py",
     "env PYTHONWARNINGS=always PYTHONUNBUFFERED=1 PSUTIL_DEBUG=1 PSUTIL_SCRIPTS_DIR={project}/scripts python {project}/psutil/tests/test_memleaks.py",
@@ -212,6 +212,10 @@ test-extras = "test"
 [tool.cibuildwheel.macos]
 archs = ["arm64", "x86_64"]
 
+[[tool.cibuildwheel.overrides]]
+select = "*-musllinux*"
+before-all = "apk --no-cache add coreutils procps"
+
 [build-system]
 build-backend = "setuptools.build_meta"
 requires = ["setuptools>=43", "wheel"]