ci: Turn centos config into alpine musl config

ci/test_imagefile

@@ -17,4 +17,7 @@ ENV BASE_ROOT_DIR=${BASE_ROOT_DIR}
 COPY ./ci/retry/retry /usr/bin/retry
 COPY ./ci/test/00_setup_env.sh ./${FILE_ENV} ./ci/test/01_base_install.sh /ci_container_base/ci/test/
 
+# Bash is required, so install it when missing
+RUN sh -c "bash -c 'true' || ( apk update && apk add --no-cache bash )"
+
 RUN ["bash", "-c", "cd /ci_container_base/ && set -o errexit && source ./ci/test/00_setup_env.sh && ./ci/test/01_base_install.sh"]