provide tool versions as envs in docker image

Motivation:
It would be nice to know package versions in derived docker images. Especially for other tool configs to point to specific versions without running additional discovery.

Dockerfile.ci

@@ -4,12 +4,19 @@ ARG BASE_IMAGE
 FROM ${BASE_IMAGE:-zephyrprojectrtos/ci-base:latest}
 
 ARG ZSDK_VERSION=0.16.3
+ENV ZSDK_VERSION=$ZSDK_VERSION
 ARG DOXYGEN_VERSION=1.9.4
+ENV DOXYGEN_VERSION=$DOXYGEN_VERSION
 ARG RENODE_VERSION=1.13.3
+ENV RENODE_VERSION=$RENODE_VERSION
 ARG LLVM_VERSION=16
+ENV LLVM_VERSION=$LLVM_VERSION
 ARG BSIM_VERSION=v2.1
+ENV BSIM_VERSION=$BSIM_VERSION
 ARG SPARSE_VERSION=9212270048c3bd23f56c20a83d4f89b870b2b26e
+ENV SPARSE_VERSION=$SPARSE_VERSION
 ARG PROTOC_VERSION=21.7
+ENV PROTOC_VERSION=$PROTOC_VERSION
 ARG WGET_ARGS="-q --show-progress --progress=bar:force:noscroll"