Configuring CI for public release with xrootd5

Joao Afonsorequested to merge
15-public-binary-rpm-distribution into main

Summary

This commit configures the CI pipeline to allow public releases of CTA versions using xrootd5 (when tagged as v5.y.z).

For more details: #15 (closed)

References

Closes #15 (closed)

Edited by Joao Afonso

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