Add unstable release workflow to the CTA CI

Summary

Additional Required Actions

• Requires manual tests in pre-production: YES/NO
• Requires a documentation update: YES/NO

References

#1017

added Continuous Integration ci: pipeline ci: runners typeignore labels

requested review from @nbugel

assigned to @afonso

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• 16476e10 - Adding unstable release CI stage and other improvements

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• 358adfe8 - Adding unstable release CI stage and other improvements

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resolved all threads

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I have tested this with the following CI with the testing tag v5.999.3.0-1.test:

• https://gitlab.cern.ch/cta/CTA/-/pipelines/10958929

We can see the test RPMs in unstable and testing (did not use stable, but the logic is identical):

• https://cta-public-repo.web.cern.ch/unstable/cta-5/el9/cta/x86_64/
• https://cta-public-repo.web.cern.ch/testing/cta-5/el9/cta/x86_64/

marked this merge request as ready

changed the description

mentioned in issue #1017

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merged

mentioned in commit 480988fe

mentioned in commit b13a1c58