chore: allow triggering tests workflow manually

[vonovak]

I don't think this is going to help but in #97 there are workflows that are "stuck" and I'd like to get them unstuck. If this works, great, otherwise I'll cherry-pick the commit from there into a new PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7d620a8) to head (7108dbf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #101   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          168       168           
  Branches        32        33    +1     
=========================================
  Hits           168       168           

Flag	Coverage Δ
node_18	100.00% <ø> (ø)
node_20	100.00% <ø> (ø)
node_22	100.00% <ø> (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.