[quinteros] Allow timestamped release builds

[bdunne]

• Allow timestamped RPMs in the release repo if they're in the release dir
• Ensure the prefix ends with a / This ensures that nightly builds from the manageiq-nightly directory are not included in the release repo when searching for release builds. "builds/manageiq/" vs. "builds/manageiq" which would include "builds/manageiq-nightly"

Fixes: https://github.com/orgs/ManageIQ/discussions/23135 Needs to be forward-ported to radjabov and master master: #489 radjabov: #490

[miq-bot]

Checked commits https://github.com/bdunne/manageiq-rpm_build/compare/5e0c841a89f22f1619158bca6a4743a1e1a2464e~...457aeb524693130b26486f9c04d0261349f9cd30 with ruby 3.1.5, rubocop 1.56.3, haml-lint 0.51.0, and yamllint 3 files checked, 1 offense detected

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• [ ] :bomb: :boom: :fire: :fire_engine: - Linter/Yaml - missing config files

[natemontgomery]

@bdunne Really appreciate this PR, it looks like the build errored out with:

Errors during downloading metadata for repository 'manageiq-17-quinteros':

[Fryguy]

radjabov is in #490 master is in #489