Docker Buildx support in CLI (#3176)

Signed-off-by: ttitsworth-fsp <ttitsworth@lila.ai>
Signed-off-by: tylertitsworth <titswortht@gmail.com>

Author: ttitsworth-lila

flytekit/image_spec/default_builder.py

@@ -478,7 +478,6 @@ def _build_image(self, image_spec: ImageSpec, *, push: bool = True) -> str:
 
             command = [
                 "docker",
-                "image",
                 "build",
                 "--tag",
                 f"{image_spec.image_name()}",