Add cpp module artifact name pattern

Copybara Import from #429

BEGIN_PUBLIC
Add cpp module artifact name pattern (#429)

see bazelbuild/bazel#22553 (comment)

Closes #429
END_PUBLIC

COPYBARA_INTEGRATE_REVIEW=#429 from PikachuHyA:artifact_name_pattern edaaf4f
PiperOrigin-RevId: 781091471
Change-Id: Ic119cf2c87ec55e8e063d358640512c48c3b4667

Author: PikachuHyA

cc/private/toolchain/unix_cc_toolchain_config.bzl

@@ -1779,7 +1779,13 @@ def _impl(ctx):
     # TODO(#8303): Mac crosstool should also declare every feature.
     if is_linux:
         # Linux artifact name patterns are the default.
-        artifact_name_patterns = []
+        artifact_name_patterns = [
+            artifact_name_pattern(
+                category_name = "cpp_module",
+                prefix = "",
+                extension = ".pcm",
+            ),
+        ]
         features = [
             cpp_modules_feature,
             cpp_module_modmap_file_feature,