Fixes #5156; Don't publish o.m.fenix[!.nightly] to nightly index

[mitchhentges]

Pull Request checklist

• Quality: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features

[JohanLorenzo]

Thanks for the quick fix! 👍

[pocmo]

🚢

[codecov-io]

Codecov Report

Merging #5157 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master   #5157   +/-   ##
========================================
  Coverage      8.92%   8.92%           
  Complexity      195     195           
========================================
  Files           234     234           
  Lines          9245    9245           
  Branches       1340    1340           
========================================
  Hits            825     825           
  Misses         8366    8366           
  Partials         54      54

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