Fixed Centos 8 download error in dockerfile and fixed mAdd bug in the…

[zaiyan-alam]

… workflow

Docker build threw the following error while installing gcc, fixed with updating the url list :

[ 2/12] RUN yum -y install make gcc:
#0 1.729 HTCondor Stable RPM Repository for Redhat Enter 13 kB/s | 2.9 kB 00:00
#0 2.146 CentOS Linux 8 - AppStream 110 B/s | 38 B 00:00
#0 2.152 Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
Dockerfile:4
2 |
3 | # install build dependencies
4 | >>> RUN yum -y install make gcc
5 |
6 | ENV HOME=/home/scitech
ERROR: failed to solve: process "/bin/sh -c yum -y install make gcc" did not complete successfully: exit code: 1