update Dockerfile override with monorepo

[drbh]

this PR simply updates the override input path for the monorepo github repo so the relu example builds.

tested locally via a rebuild of the docker image

cd builder/dockerfiles && \
  docker build -t kernel-builder:local -f Dockerfile .

and ran with

cd ../../builder/examples/relu
docker run --rm \
  -v $(pwd):/app \
  -w /app \
  kernel-builder:local build --jobs 1 --cores 8

note this took 23m37s and output

tree build -L 1
# build
# ├── torch210-cxx11-cpu-x86_64-linux
# ├── torch210-cxx11-cu126-x86_64-linux
# ├── torch210-cxx11-cu128-x86_64-linux
# ├── torch210-cxx11-cu130-x86_64-linux
# ├── torch210-cxx11-rocm70-x86_64-linux
# ├── torch210-cxx11-rocm71-x86_64-linux
# ├── torch210-cxx11-xpu20253-x86_64-linux
# ├── torch29-cxx11-cpu-x86_64-linux
# ├── torch29-cxx11-cu126-x86_64-linux
# ├── torch29-cxx11-cu128-x86_64-linux
# ├── torch29-cxx11-cu130-x86_64-linux
# ├── torch29-cxx11-rocm63-x86_64-linux
# ├── torch29-cxx11-rocm64-x86_64-linux
# └── torch29-cxx11-xpu20252-x86_64-linux