revert printing dockerfile

Author: oliverchang

infra/build/functions/build_lib.py

@@ -460,11 +460,6 @@ def get_project_image_steps(  # pylint: disable=too-many-arguments
     steps.extend(get_pull_test_images_steps(config.test_image_suffix))
   src_root = 'oss-fuzz' if not experiment else '.'
 
-  steps.append({
-      'name': 'ubuntu',
-      'args': ['bash', '-c', f'cat {src_root}/projects/{name}/Dockerfile'],
-  })
-
   docker_build_step = get_docker_build_step([image],
                                             os.path.join('projects', name),
                                             src_root=src_root,