update local build script

Signed-off-by: Peter St. John <pstjohn@nvidia.com>

Author: pstjohn

ci/recipes_build_and_test.py

@@ -169,6 +169,8 @@ def discover_build_directories(self) -> List[Path]:
                 continue
 
             for subdir in parent_path.iterdir():
+                if subdir.name.startswith("."):
+                    continue
                 if subdir.is_dir() and (subdir / "Dockerfile").exists():
                     build_dirs.append(subdir)
                 elif subdir.is_dir():