add liger-kernel to docker file (#38292)

add

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

docker/transformers-all-latest-gpu/Dockerfile

@@ -71,6 +71,9 @@ RUN python3 -m pip install --no-cache-dir g2p-en
 # For Some bitsandbytes tests
 RUN python3 -m pip install --no-cache-dir einops
 
+# For Some tests with `@require_liger_kernel`
+RUN python3 -m pip install --no-cache-dir liger-kernel
+
 # `kernels` may give different outputs (within 1e-5 range) even with the same model (weights) and the same inputs
 RUN python3 -m pip uninstall -y kernels