ci: stop cancelling in-progress runs on new pushes

[spomichter]

Problem

With cancel-in-progress: true, any new push to a PR immediately kills the running CI workflow. This includes commits pushed by autofix.ci (formatting fixes), which means:

1. You push code
2. CI starts running tests
3. autofix.ci pushes a format commit 6 seconds later
4. Your entire CI run gets cancelled
5. PR shows X failures even though nothing actually failed

Example: https://github.com/dimensionalOS/dimos/actions/runs/26152674707

Fix

Set cancel-in-progress: false. Existing runs complete normally. New pushes still trigger their own CI run — they just queue instead of killing the previous one.

What is NOT affected

• Intra-run fail-fast (matrix job cancellation when one job fails) — this is controlled by strategy.fail-fast on the matrix, completely independent
• Concurrency grouping — still grouped per-PR, so runs are serialized (not parallel)

Tradeoff

Slightly more runner minutes on stale commits (old run finishes even if a new commit arrives). But no more phantom failures from autofix races.

[greptile-apps]

Greptile Summary

The PR disables cancel-in-progress in the CI concurrency block to prevent phantom failures caused by autofix.ci formatting commits cancelling in-flight test runs. No issues found — clean, well-reasoned change.

Confidence Score: 5/5

Safe to merge — the one-line change is well-reasoned and does not touch any job logic.

The change is a single boolean flag flip in the concurrency block. The rest of the workflow — including the cross-job fail-fast job, the matrix fail-fast, and the per-PR concurrency group — is completely untouched and continues to behave as before.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/ci.yml	Single-line change: cancel-in-progress flipped from true to false with the associated comment removed. Logic is correct and the rest of the workflow is untouched.

_{Reviews (1): Last reviewed commit: "ci: stop cancelling in-progress runs on ..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[leshy]

we discussed this https://discord.com/channels/1341146487186391173/1500695132876439582/1506589906867327027

not super sold