ray(serve): drive dlc_major/minor_version LABELs from config ARGs

The Ray Serve Dockerfiles hardcoded LABEL dlc_major_version / dlc_minor_version
as static text, so the config's dlc_major_version / dlc_minor_version were passed
as --build-arg but silently ignored (no matching ARG). Config and LABEL could
drift, and only the LABEL affected the released version — editing the config did
nothing.

Add ARG DLC_MAJOR_VERSION / ARG DLC_MINOR_VERSION and interpolate them into the
LABELs (both Dockerfile.cuda and Dockerfile.cpu), matching vllm/sglang amzn2023
and the new ray-train image. The config build: block is now the single source of
truth for the DLC version.

Author: Eren-Jeager123

docker/ray/Dockerfile.cpu

@@ -54,9 +54,11 @@ FROM amazonlinux:2023 AS base
 ARG CACHE_REFRESH=0
 RUN dnf upgrade -y --security --releasever latest && dnf clean all && rm -rf /var/cache/dnf
 
+ARG DLC_MAJOR_VERSION=1
+ARG DLC_MINOR_VERSION=2
 LABEL maintainer="Amazon AI"
-LABEL dlc_major_version="1"
-LABEL dlc_minor_version="2"
+LABEL dlc_major_version="${DLC_MAJOR_VERSION}"
+LABEL dlc_minor_version="${DLC_MINOR_VERSION}"
 
 ARG PYTHON_VERSION=3.13.12
 ARG PYTHON_SHORT_VERSION=3.13

docker/ray/Dockerfile.cuda

@@ -83,9 +83,11 @@ FROM nvidia/cuda:12.9.1-runtime-amzn2023 AS base
 ARG CACHE_REFRESH=0
 RUN dnf upgrade -y --security --releasever latest && dnf clean all && rm -rf /var/cache/dnf
 
+ARG DLC_MAJOR_VERSION=1
+ARG DLC_MINOR_VERSION=2
 LABEL maintainer="Amazon AI"
-LABEL dlc_major_version="1"
-LABEL dlc_minor_version="2"
+LABEL dlc_major_version="${DLC_MAJOR_VERSION}"
+LABEL dlc_minor_version="${DLC_MINOR_VERSION}"
 
 ARG PYTHON_VERSION=3.13.12
 ARG PYTHON_SHORT_VERSION=3.13