Append failed system test log tails to GHA job summary

[PranjalManhgaye]

Summary

• on failure now , we append the last (100 lines, collapsible, all stages) of the relevant stage log ( build / run / compare ) to the GHA job summary.
• stage is inferred from timings ( fieldcompare_time → compare , else solver_time → run, else build ).
• Closes System tests job summary does not include the actual error #792.

Test plan

• local quickstart pass — summary shows timing table only
• local failed run — summary shows ( ## Failed test logs ) with compare log tail
• added changelog entry in changelog-entries/ 830.md

[MakisH]

Thanks for implementing! A first run looks good: https://github.com/precice/tutorials/actions/runs/27284473467

Since the job summary renders Markdown, I assume it can also render HTML. What if we display more lines (say 100) and put them into collapsible sections? Sometimes (like in this job failing at run), there is useful information higher up in the other participant.

[PranjalManhgaye]

thanks @MakisH for testing this , and as per your feedback i have updated 100 lines per stage (better for interleaved run logs) , collapsible details for each run like :
1 (build log) 100 lines

Details

100 lines

2 (run log) 100 lines

Details

100 lines

3 (compare log) if error then mentioned failure stage here in case

Details

100 lines

ofc reverted footer and stage detection is unchanged , also tested locally

[MakisH]

Looks even better now, nice! See https://github.com/precice/tutorials/actions/runs/27292023168