Fix hammercli dockerfile

[msajidmansoori12]

Description

The Dockerfile fails to build because the mirror https://mirror.centos.org is not available anymore and so when trying to build it throws the error CentOS Linux 8 - AppStream 18 B/s | 38 B 00:02 Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist Error: error building at STEP "RUN dnf install -y epel-release python3": error while running runtime: exit status 1 The PR sets alternative mirror instead so that the Dockerfile builds successfully.

Testing

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] While trying to build the dockerfile using podman build -t hammercli . the issue arises which is fixed when setting the alternative mirror for centos to http://vault.centos.org

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