Publish snapshots from Linux instead of a macOS runner

[jamesarich]

publish-snapshot runs on macos-latest but only publishes Kotlin artifacts, and Kotlin/Native cross-compiles the Apple klibs from any host.

Verified, not assumed

Linux, Kotlin 2.4.10, no opt-in flag:

Check	Result
publishToMavenLocal	14 artifacts — exactly what Maven Central holds for 0.9.1
iOS klibs	504K each (iosarm64, iosx64, iossimulatorarm64)

Nothing is lost

The Apple tests this job depends on already run on macOS in kotlin-native and swift, and the existing needs: [kotlin, kotlin-native, swift, python, typescript, csharp] makes them a hard precondition. So unlike the sibling PRs in kzstd and meshtastic-sdk, no CI guard is needed — needs: already is one.

This job fires on every push to main, so it is a far more frequent macOS consumer than the release workflow.

Also caches ~/.konan

This job never did. On a cold Linux runner the Kotlin/Native toolchain download would otherwise sit on the critical path.

Why release.yml is untouched

It is a single macOS job that also runs the Swift, Python, TypeScript and C# suites, and swift test needs macOS. Moving its Maven publish would mean either a second runner (no queue-time win, more complexity) or migrating the Swift gate to a CI check-run guard — a bigger change than this one, and better judged separately.

Part of a set: meshtastic/kzstd#68, meshtastic/meshtastic-sdk#114, meshtastic/MQTTastic-Client-KMP#135.

Summary by CodeRabbit

• Chores
  • Improved snapshot publishing reliability by running it on a Linux environment.
  • Added caching for the Kotlin/Native toolchain to speed up repeated builds.
  • Apple-specific tests continue to run on macOS in the appropriate CI jobs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0d0b50a9-84c6-4d82-b47a-06fa8bf0484d

📥 Commits

Reviewing files that changed from the base of the PR and between d9baa9c and 81bde31.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The publish-snapshot CI job now runs on Ubuntu instead of macOS. It also caches the Kotlin/Native ~/.konan directory using Kotlin and Gradle files as cache inputs.

Changes

Snapshot publishing CI

Layer / File(s)	Summary
Update snapshot publishing job .github/workflows/ci.yml	The job runs on ubuntu-latest. A Konan cache step caches ~/.konan using Kotlin version catalog and Gradle wrapper files.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 81bde

This localized CI change moves snapshot publishing to Linux and caches the Kotlin/Native toolchain without introducing an actionable merge-blocking risk; it is merge-ready after normal checks and review.

Poem

A rabbit checks the workflow line
Ubuntu hops into the build
Konan rests in cached leaves
Apple klibs cross the sky
Snapshots spring forth, neat and quick

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: moving snapshot publishing from macOS runners to Linux runners.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

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