Merge branch 'master' into 'master'

Switch to rockylinux 8 and clang-format 13

See merge request docker-images/gr-build-images!22

code-style-check/Dockerfile

 FROM debian:sid
 LABEL maintainer="Ingo Meyer <i.meyer@fz-juelich.de>"
 
-ARG CLANG_FORMAT_VERSION="9"
+ARG CLANG_FORMAT_VERSION="13"
 ARG CMAKE_FORMAT_VERSION="0.6.7"
 
 RUN apt-get update && \

deploy-to-obs/Dockerfile

-FROM docker.io/centos:centos8
+FROM rockylinux:8
 LABEL maintainer="Christian Felder"
 
 WORKDIR /root