[70] Use shared workflow for deployment

[voj]

closes #70

successful test deployment https://github.com/GNS-Science/solvis-graphql-api/actions/runs/17313577861/job/49153019793

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.63%. Comparing base (81eec7e) to head (a657172).
⚠️ Report is 15 commits behind head on deploy-test.

Additional details and impacted files

@@               Coverage Diff               @@
##           deploy-test      #71      +/-   ##
===============================================
- Coverage        92.50%   90.63%   -1.88%     
===============================================
  Files               15       16       +1     
  Lines              827      790      -37     
  Branches            71       61      -10     
===============================================
- Hits               765      716      -49     
- Misses              49       67      +18     
+ Partials            13        7       -6     

Flag	Coverage Δ
unittests	90.63% <ø> (?)

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