ci(workflows): move Testing and Release jobs from jp-arm-oracle to ubuntu-latest

[AnnatarHe]

Why

The self-hosted runner jp-arm-oracle is down, so every job pinned to that label sits in queued forever.

What

• All jobs that targeted jp-arm-oracle now run on GitHub-hosted ubuntu-latest.

🤖 Generated with Claude Code

https://claude.ai/code/session_017sLELT63L4qrjvuM3BVq4o

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[claude]

Review

Small, well-scoped CI fix — changes runs-on: jp-arm-oracle → runs-on: ubuntu-latest in testing.yml (test job) and release.yml (release job).

Correctness: Good. Both pipelines build/test a JVM (Kotlin) plugin via Gradle — nothing in either workflow is architecture-specific, so moving from the (ARM) self-hosted runner to GitHub-hosted ubuntu-latest (x86_64) is safe and shouldn't change build/test behavior.

Completeness: Confirmed no other workflow files (claude.yml, claude-code-review.yml) or configs still reference jp-arm-oracle, so this fully resolves the stuck-runner issue.

Minor considerations (non-blocking):

• If this repo is private, GitHub-hosted runner minutes are billed, unlike the self-hosted runner — probably an acceptable tradeoff given the runner is down, but worth being aware of if CI cost/minutes matter here.
• Not something to fix in this PR, but if jp-arm-oracle comes back online later, it might be worth adding a comment or issue reference noting why these were moved off it, so a future contributor doesn't wonder if reverting is safe.

Security: No concerns — no secrets or permissions changed, same actions/tokens used as before.

Tests: N/A — this is a CI infrastructure change with no application code affected.

Looks good to merge.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

❌ Your project status has failed because the head coverage (14.30%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   18.01%   14.30%   -3.72%     
==========================================
  Files          20       20              
  Lines         766      755      -11     
  Branches      172      172              
==========================================
- Hits          138      108      -30     
- Misses        593      630      +37     
+ Partials       35       17      -18     

see 8 files with indirect coverage changes

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