set up v0.12.0 release

Signed-off-by: Johnny Yang <johnnyyang@google.com>

Author: jcyang43

docker/Dockerfile

@@ -1,7 +1,7 @@
 ARG NIGHTLY_DATE="20250714"
 ARG BASE_IMAGE="us-central1-docker.pkg.dev/tpu-pytorch-releases/docker/xla:nightly_3.12_tpuvm_$NIGHTLY_DATE"
 # The latest main will be used if arg unspecified
-ARG VLLM_COMMIT_HASH=""
+# ARG VLLM_COMMIT_HASH=""
 
 FROM $BASE_IMAGE
 
@@ -18,11 +18,12 @@ RUN apt-get update && apt-get install -y \
 # Build vLLM
 WORKDIR /workspace/vllm
 ARG VLLM_REPO=https://github.com/vllm-project/vllm.git
-ARG VLLM_COMMIT_HASH
+# ARG VLLM_COMMIT_HASH
 RUN git clone $VLLM_REPO /workspace/vllm
-RUN if [ -n "$VLLM_COMMIT_HASH" ]; then \
-        git checkout $VLLM_COMMIT_HASH; \
-    fi
+RUN git checkout v0.12.0
+# RUN if [ -n "$VLLM_COMMIT_HASH" ]; then \
+#         git checkout $VLLM_COMMIT_HASH; \
+#     fi
 RUN pip install -r requirements/tpu.txt --retries 3
 RUN VLLM_TARGET_DEVICE="tpu" pip install -e .