fix ci run for develop branch, also fixes test badge

[metachris]

📝 Summary

• Missing change from main -> develop
• Fixes 'failing tests' branch on develop README (currently it's just referring to whatever latest CI run, after this PR will refer to latest test on develop branch)

---

✅ I have run these commands

• make lint
• make test-race
• go mod tidy

[codecov-commenter]

Codecov Report

Merging #556 (1868fc7) into develop (54eeaa2) will decrease coverage by 0.28%.
Report is 257 commits behind head on develop.
The diff coverage is 64.23%.

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@@             Coverage Diff             @@
##           develop     #556      +/-   ##
===========================================
- Coverage    70.24%   69.96%   -0.28%     
===========================================
  Files            6        7       +1     
  Lines          541     1102     +561     
===========================================
+ Hits           380      771     +391     
- Misses         132      287     +155     
- Partials        29       44      +15     

Flag	Coverage Δ
unittests	69.96% <64.23%> (-0.28%)	⬇️

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

Files Changed	Coverage Δ
cli/main.go	0.00% <0.00%> (ø)
cli/types.go	0.00% <0.00%> (ø)
server/utils.go	74.50% <74.56%> (+6.93%)	⬆️
server/service.go	80.87% <78.70%> (+8.85%)	⬆️
server/mock_relay.go	92.18% <93.68%> (+9.33%)	⬆️
server/mock_types.go	100.00% <100.00%> (ø)
server/relay_entry.go	90.00% <100.00%> (+8.75%)	⬆️

... and 1 file with indirect coverage changes