Add flash attention to UBI docker build

Dockerfile.ubi

@@ -1,5 +1,5 @@
 ## Global Args #################################################################
-ARG BASE_UBI_IMAGE_TAG=9.3-1552
+ARG BASE_UBI_IMAGE_TAG=9.3-1612
 ARG PYTHON_VERSION=3.11
 ARG PYTORCH_INDEX="https://download.pytorch.org/whl"
 # ARG PYTORCH_INDEX="https://download.pytorch.org/whl/nightly"
@@ -187,6 +187,25 @@ RUN curl -Lo vllm.whl https://github.com/vllm-project/vllm/releases/download/v${
     && rm vllm.whl
 # compiled extensions located at /workspace/vllm/*.so
 
+#################### FLASH_ATTENTION Build IMAGE ####################
+FROM dev as flash-attn-builder
+
+RUN microdnf install -y git \
+    && microdnf clean all
+
+# max jobs used for build
+ARG max_jobs=2
+ENV MAX_JOBS=${max_jobs}
+# flash attention version
+ARG flash_attn_version=v2.5.6
+ENV FLASH_ATTN_VERSION=${flash_attn_version}
+
+WORKDIR /usr/src/flash-attention-v2
+
+# Download the wheel or build it if a pre-compiled release doesn't exist
+RUN pip --verbose wheel flash-attn==${FLASH_ATTN_VERSION} \
+    --no-build-isolation --no-deps --no-cache-dir
+
 
 ## Test ########################################################################
 FROM dev AS test
@@ -199,6 +218,9 @@ ADD . /vllm-workspace/
 # copy pytorch extensions separately to avoid having to rebuild
 # when python code changes
 COPY --from=build /workspace/vllm/*.so /vllm-workspace/vllm/
+# Install flash attention (from pre-built wheel)
+RUN --mount=type=bind,from=flash-attn-builder,src=/usr/src/flash-attention-v2,target=/usr/src/flash-attention-v2 \
+    pip install /usr/src/flash-attention-v2/*.whl --no-cache-dir
 # ignore build dependencies installation because we are using pre-complied extensions
 RUN rm pyproject.toml
 RUN --mount=type=cache,target=/root/.cache/pip \
@@ -254,9 +276,13 @@ RUN --mount=type=cache,target=/root/.cache/pip \
     pip3 install \
         -r requirements.txt \
         # additional dependencies for the TGIS gRPC server
-        grpcio-tools==1.62.0 \
+        grpcio-tools==1.62.1 \
         # additional dependencies for openai api_server
-        accelerate==0.27.2
+        accelerate==0.28.0
+
+# Install flash attention (from pre-built wheel)
+RUN --mount=type=bind,from=flash-attn-builder,src=/usr/src/flash-attention-v2,target=/usr/src/flash-attention-v2 \
+    pip3 install /usr/src/flash-attention-v2/*.whl --no-cache-dir
 
 # vLLM will not be installed in site-packages
 COPY --from=vllm --link /workspace/ ./