feat: read public key from release yaml

[bryanoltman]

Description

Updates Updater to read (optional) public key from release yaml.

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.19%. Comparing base (6ab6972) to head (77cf072).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
+ Coverage   96.15%   96.19%   +0.04%     
==========================================
  Files          28       28              
  Lines        3091     3126      +35     
==========================================
+ Hits         2972     3007      +35     
  Misses        119      119              

Flag	Coverage Δ
library	97.85% <100.00%> (+0.02%)	⬆️

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