reset default clang

Author: StephanKa

docker/Dockerfile

@@ -5,7 +5,7 @@
 FROM ubuntu:23.04 as cpp-docker-common
 
 ARG DEBIAN_FRONTEND=noninteractive
-ARG CLANG_COMPILER_VERSION=17
+ARG CLANG_COMPILER_VERSION=15
 ARG CMAKE_VERSION=3.28.3
 ENV PATH="${PATH}:/cmake-${CMAKE_VERSION}-linux-x86_64/bin/:"