[update]: removed flash attention

Author: yeshsurya

assets/training/finetune_acft_hf_nlp/environments/acpt-rft/context/Dockerfile

@@ -69,9 +69,6 @@ COPY azure_grader /opt/conda/envs/ptca/lib/python3.10/site-packages/verl/utils/r
 COPY azure_python_grader /opt/conda/envs/ptca/lib/python3.10/site-packages/verl/utils/reward_score/azure_python_grader.py
 COPY utils /opt/conda/envs/ptca/lib/python3.10/site-packages/verl/utils/vllm/utils.py
 RUN python3 -m pip install --upgrade pip setuptools wheel
-ENV FLASH_ATTENTION_FORCE_BUILD=TRUE
-ENV NVCC_THREADS=1
-RUN MAX_JOBS=1 pip install --no-cache-dir --upgrade flash-attn==2.8.3 --no-build-isolation
 RUN pip install vllm==0.13.0
 RUN pip install openai==2.14.0
 RUN pip install --force-reinstall --no-cache-dir --no-build-isolation git+https://github.com/deepseek-ai/DeepGEMM.git@c9f8b34dcdacc20aa746b786f983492c51072870