HSS docker build error - No matching repo to modify: PowerTools.

[kulkarnima]

Following error encountered building docker image for oai-hss(branch: master):

> Error: No matching repo to modify: PowerTools.
> The command '/bin/sh -c yum update -y   && yum install epel-release -y   && yum install dnf-plugins-core -y   && yum config-manager --set-enabled PowerTools   && yum install -y     psmisc     git   && yum clean all -y   && rm -rf /var/cache/yum' returned a non-zero code: 1

Command used for build:
docker build --target oai-hss --tag oai-hss:production --file component/oai-hss/docker/Dockerfile.centos8 component/oai-hss