Store ref in metadata file

[blink1073]

Fixes #376

[codecov-commenter]

Codecov Report

Merging #375 (216e7dc) into main (4634184) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #375      +/-   ##
==========================================
- Coverage   82.92%   82.86%   -0.06%     
==========================================
  Files          21       21              
  Lines        2869     2871       +2     
  Branches      375      376       +1     
==========================================
  Hits         2379     2379              
- Misses        356      357       +1     
- Partials      134      135       +1     

Impacted Files	Coverage Δ
jupyter_releaser/cli.py	90.90% <ø> (ø)
jupyter_releaser/lib.py	80.82% <ø> (ø)
jupyter_releaser/util.py	71.59% <0.00%> (-0.35%)	⬇️

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[blink1073]

@davidbrochart I think I found the bug. Either way there is more logging now.

[fcollonval]

This will fix #376