fix(ci): fix incorrect Dockerfile

Signed-off-by: Adrien <adrien@huggingface.co>

Author: XciD

.github/workflows/build.yaml

@@ -148,7 +148,7 @@ jobs:
         with:
           context: .
           target: grpc
-          file: Dockerfile-cuda
+          file: ${{ matrix.dockerfile }}
           push: ${{ github.event_name != 'pull_request' }}
           platforms: 'linux/amd64'
           build-args: |