fix: handle missing directories in docs-build test

The docs-build.py checker was failing with FileNotFoundError when trying
to copy directories and files that don't exist in the repository (such as
'bin', 'lib', etc.). These directories are only present after cloning
ansible-core using 'nox -s clone-core'.

This fix adds existence checks before attempting to copy directories and
files, making the test more robust and preventing errors when running in
environments where ansible-core hasn't been cloned yet.

Author: claude

tests/checkers/docs-build.py

@@ -34,10 +34,14 @@ def main():
 
     with tempfile.TemporaryDirectory(prefix='docs-build-', suffix='-sanity') as temp_dir:
         for keep_dir in keep_dirs:
-            shutil.copytree(os.path.join(base_dir, keep_dir), os.path.join(temp_dir, keep_dir), symlinks=True)
+            src_path = os.path.join(base_dir, keep_dir)
+            if os.path.exists(src_path):
+                shutil.copytree(src_path, os.path.join(temp_dir, keep_dir), symlinks=True)
 
         for keep_file in keep_files:
-            shutil.copy2(os.path.join(base_dir, keep_file), os.path.join(temp_dir, keep_file))
+            src_file = os.path.join(base_dir, keep_file)
+            if os.path.exists(src_file):
+                shutil.copy2(src_file, os.path.join(temp_dir, keep_file))
 
         paths = os.environ['PATH'].split(os.pathsep)
         paths = [f'{temp_dir}/bin' if path == f'{current_dir}/bin' else path for path in paths]