ci: Only run reusable package in public repos

[mathbunnyru]

High Level Overview of Change

Context of Change

We upload only in public repos, so we can only run this workflow in public repos (at least for now)

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.1%. Comparing base (1e45d36) to head (e9421e2).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #7293     +/-   ##
=========================================
- Coverage     82.1%   82.1%   -0.0%     
=========================================
  Files         1010    1010             
  Lines        76164   76164             
  Branches      7423    7411     -12     
=========================================
- Hits         62509   62505      -4     
- Misses       13655   13659      +4     

see 6 files with indirect coverage changes

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