Add ccache to amd (#5555)

.buildkite/test-template-aws.j2

@@ -30,6 +30,7 @@ steps:
         command: bash .buildkite/run-amd-test.sh "cd {{ (step.working_dir or default_working_dir) | safe  }} ; {{ step.command  or (step.commands | join(" ; ")) | safe }}"
         env:
           DOCKER_BUILDKIT: "1"
+        priority: 100
         soft_fail: true
     {% endif %}
     {% endfor %}

Dockerfile.rocm

@@ -42,6 +42,7 @@ RUN apt-get update && apt-get install -y \
     unzip \
     nvidia-cuda-toolkit \
     tmux \
+    ccache \
  && rm -rf /var/lib/apt/lists/*
 
 ### Mount Point ###
@@ -102,7 +103,9 @@ ENV RAY_EXPERIMENTAL_NOSET_ROCR_VISIBLE_DEVICES=1
 
 ENV VLLM_NCCL_SO_PATH=/opt/rocm/lib/librccl.so
 
-RUN --mount=type=cache,target=/root/.cache/pip \
+ENV CCACHE_DIR=/root/.cache/ccache
+RUN --mount=type=cache,target=/root/.cache/ccache \
+    --mount=type=cache,target=/root/.cache/pip \
     pip install -U -r requirements-rocm.txt \
     && patch /opt/rocm/include/hip/amd_detail/amd_hip_bf16.h ./rocm_patch/rocm_bf16.patch \
     && python3 setup.py install \