update ci/docker/centos-7-core.dockerfile

ci/docker/centos-7-core.dockerfile

 ARG arch=amd64
 FROM ${arch}/centos:7
 
+# pipefail is enabled for proper error detection in the `wget`
+# step
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
 RUN yum install -y epel-release centos-release-scl-rh && yum install -y wget curl which && \
     wget -qO- "https://cmake.org/files/v3.14/cmake-3.14.3-Linux-x86_64.tar.gz" | tar --strip-components=1 -xz -C /usr/local && \
     yum install -y ccache make automake git python3-pip libcurl-devel python3-devel boost-static mysql-devel \