Add show-ref subcommand

[SandrineP]

Add show-ref subcommand

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.37%. Comparing base (f2e1dfb) to head (123dbaf).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
- Coverage   88.27%   87.37%   -0.90%     
==========================================
  Files          61       62       +1     
  Lines        2627     2662      +35     
  Branches      309      312       +3     
==========================================
+ Hits         2319     2326       +7     
- Misses        308      336      +28     

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