cft: fix first level of import on new builders

Need to properly append the src detection to the entry point

BUG=None
TEST=./test/python/src/docker_libs/cli/build-dockerimages.py

Change-Id: I411b44f04c37d41cb9e2ee534197f3e542dd139f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3621940
Tested-by: Derek Beckett <[email protected]>
Reviewed-by: Jaques Clapauch <[email protected]>
diff --git a/src/chromiumos/test/python/src/docker_libs/cli/build-dockerimages.py b/src/chromiumos/test/python/src/docker_libs/cli/build-dockerimages.py
index d50a514..e0ecb89 100755
--- a/src/chromiumos/test/python/src/docker_libs/cli/build-dockerimages.py
+++ b/src/chromiumos/test/python/src/docker_libs/cli/build-dockerimages.py
@@ -8,13 +8,13 @@
 
 
 import argparse
-
+import pathlib
 import shutil
 import sys
 import traceback
 
 # Point up a few directories to make the other python modules discoverable.
-sys.path.append('../../../')
+sys.path.insert(1, str(pathlib.Path(__file__).parent.resolve()/'../../../'))
 
 from src.docker_libs.build_libs.builders import GcloudDockerBuilder, LocalDockerBuilder  # pylint: disable=import-error,wrong-import-position
 from src.docker_libs.build_libs.shared.common_service_prep import CommonServiceDockerPrepper