feature: add musllinux_1_2 support (#1561)

* feature: add musllinux_1_2 support

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* fix[test]: clean-up docker images in test_*linux*_only.py

We are reaching disk space limits (14 GB) when running tests.
Add a fixture to clean-up docker images after tests.
This fixture is applied on tests that pull a specific image for one test only in order not to take too much time pulling that image many times.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

test/test_musllinux_X_Y_only.py

@@ -0,0 +1,56 @@
+from __future__ import annotations
+
+import textwrap
+
+import pytest
+
+from . import test_projects, utils
+
+project_with_manylinux_symbols = test_projects.new_c_project(
+    spam_c_top_level_add=textwrap.dedent(
+        r"""
+        #include <stdlib.h>
+
+        #if defined(__GLIBC_PREREQ)
+        #error "Must not run on a glibc linux environment"
+        #endif
+        """
+    ),
+    spam_c_function_add=textwrap.dedent(
+        r"""
+        sts = 0;
+        """
+    ),
+)
+
+
+@pytest.mark.parametrize(
+    "musllinux_image",
+    ["musllinux_1_1", "musllinux_1_2"],
+)
+@pytest.mark.usefixtures("docker_cleanup")
+def test(musllinux_image, tmp_path):
+    if utils.platform != "linux":
+        pytest.skip("the container image test is only relevant to the linux build")
+
+    project_dir = tmp_path / "project"
+    project_with_manylinux_symbols.generate(project_dir)
+
+    # build the wheels
+    add_env = {
+        "CIBW_BUILD": "*-musllinux*",
+        "CIBW_MUSLLINUX_X86_64_IMAGE": musllinux_image,
+        "CIBW_MUSLLINUX_I686_IMAGE": musllinux_image,
+        "CIBW_MUSLLINUX_AARCH64_IMAGE": musllinux_image,
+        "CIBW_MUSLLINUX_PPC64LE_IMAGE": musllinux_image,
+        "CIBW_MUSLLINUX_S390X_IMAGE": musllinux_image,
+    }
+
+    actual_wheels = utils.cibuildwheel_run(project_dir, add_env=add_env)
+    expected_wheels = utils.expected_wheels(
+        "spam",
+        "0.1.0",
+        manylinux_versions=[],
+        musllinux_versions=[musllinux_image],
+    )
+    assert set(actual_wheels) == set(expected_wheels)