[29] use reusable workflow for testing

[voj]

closes #29

Note that I needed to change the nzshm-model version as the old one no longer exists.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6a5c629) to head (bfb7dbc).
Report is 6 commits behind head on deploy-test.

Additional details and impacted files

@@              Coverage Diff              @@
##           deploy-test       #31   +/-   ##
=============================================
  Coverage       100.00%   100.00%           
=============================================
  Files                5         6    +1     
  Lines              152       234   +82     
  Branches             7        11    +4     
=============================================
+ Hits               152       234   +82     

Flag	Coverage Δ
unittests	100.00% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.