[CI] Exclude docs directories from triggering rebuilds

.ci/compute_projects.py

@@ -194,6 +194,12 @@ def _compute_runtime_check_targets(runtimes_to_test: Set[str]) -> Set[str]:
 def _get_modified_projects(modified_files: list[str]) -> Set[str]:
     modified_projects = set()
     for modified_file in modified_files:
+        path_parts = pathlib.Path(modified_file).parts
+        # Exclude files in the docs directory. They do not impact an test
+        # targets and there is a separate workflow used for ensuring the
+        # documentation builds.
+        if len(path_parts) > 2 and path_parts[1] == "docs":
+            continue
         modified_projects.add(pathlib.Path(modified_file).parts[0])
     return modified_projects
 

.ci/compute_projects_test.py

@@ -170,6 +170,15 @@ def test_exclude_runtiems_in_projects(self):
         self.assertEqual(env_variables["runtimes_to_build"], "")
         self.assertEqual(env_variables["runtimes_check_targets"], "")
 
+    def test_exclude_docs(self):
+        env_variables = compute_projects.get_env_variables(
+            ["llvm/docs/CIBestPractices.rst"], "Linux"
+        )
+        self.assertEqual(env_variables["projects_to_build"], "")
+        self.assertEqual(env_variables["project_check_targets"], "")
+        self.assertEqual(env_variables["runtimes_to_build"], "")
+        self.assertEqual(env_variables["runtimes_check_targets"], "")
+
 
 if __name__ == "__main__":
     unittest.main()