[Release] [ROCm] Remove old build step (#33316)

Signed-off-by: tjtanaa <tunjian.tan@embeddedllm.com>

.buildkite/release-pipeline.yaml

@@ -176,23 +176,6 @@ steps:
         env:
           DOCKER_BUILDKIT: "1"
 
-      - block: "Build release image for x86_64 ROCm"
-        key: block-rocm-release-image-build
-        depends_on: ~
-
-      - label: "Build release image - x86_64 - ROCm"
-        depends_on: block-rocm-release-image-build
-        id: build-release-image-rocm
-        agents:
-          queue: cpu_queue_postmerge
-        commands:
-          - "aws ecr-public get-login-password --region us-east-1 | docker login --username AWS --password-stdin public.ecr.aws/q9t5s3a7"
-          # Build base image first
-          - "DOCKER_BUILDKIT=1 docker build --build-arg max_jobs=16 --tag rocm/vllm-dev:base-$BUILDKITE_COMMIT --target final --progress plain -f docker/Dockerfile.rocm_base ."
-          # Build vLLM ROCm image using the base
-          - "DOCKER_BUILDKIT=1 docker build --build-arg max_jobs=16 --build-arg BASE_IMAGE=rocm/vllm-dev:base-$BUILDKITE_COMMIT --tag public.ecr.aws/q9t5s3a7/vllm-release-repo:$BUILDKITE_COMMIT-rocm --target vllm-openai --progress plain -f docker/Dockerfile.rocm ."
-          - "docker push public.ecr.aws/q9t5s3a7/vllm-release-repo:$BUILDKITE_COMMIT-rocm"
-
   - group: "Publish release images"
     key: "publish-release-images"
     steps:
@@ -476,7 +459,7 @@ steps:
       S3_BUCKET: "vllm-wheels"
 
   # ROCm Job 2: Build vLLM ROCm Wheel
-  - label: ":python: Build vLLM ROCm Wheel"
+  - label: ":python: Build vLLM ROCm Wheel - x86_64"
     id: build-rocm-vllm-wheel
     depends_on:
       - step: build-rocm-base-wheels
@@ -666,7 +649,7 @@ steps:
       VARIANT: "rocm700"
 
   # ROCm Job 5: Build ROCm Release Docker Image
-  - label: ":rocm: :docker: Build ROCm Release Docker Image"
+  - label: ":docker: Build release image - x86_64 - ROCm"
     id: build-rocm-release-image
     depends_on:
       - step: build-rocm-base-wheels