fix(ci): restrict code-cleanup workflow to Linux runners only

[spomichter]

Problem

code-cleanup.yml uses runs-on: self-hosted which matches all self-hosted runners — including the macOS EC2 runner. That runner runs as ec2-user (home: /Users/ec2-user) and actions/setup-python tries to create /Users/runner/ which doesn't exist, causing:

Error: mkdir: /Users/runner: Permission denied
Error: The process '/bin/bash' failed with exit code 1

This has been failing 4+ times on PRs including #1925 and #1940.

Fix

One line:

# before
runs-on: self-hosted

# after  
runs-on: [self-hosted, Linux]

Consistent with tests.yml and docker.yml which already scope to [self-hosted, Linux].

Scope

No logic changes. Zero risk.

[greptile-apps]

Greptile Summary

Adds Linux label to the runs-on array in code-cleanup.yml, narrowing runner selection from all self-hosted runners to Linux-only. This matches the existing pattern in tests.yml and docker.yml and directly fixes the permission error (mkdir: /Users/runner: Permission denied) that caused repeated failures on macOS EC2 runners.

Confidence Score: 5/5

Safe to merge — one-line runner label addition with zero logic changes.

The change is minimal, targeted, and consistent with the existing runner configuration pattern across other workflow files in the repo. No logic, permissions, or step ordering is modified.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/code-cleanup.yml	Single-line fix: runs-on: self-hosted → runs-on: [self-hosted, Linux], aligning runner targeting with the rest of the CI workflows and preventing macOS runner mismatches.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[PR Event Triggered] --> B{Runner Selection}
    B -- "Before: runs-on: self-hosted" --> C[Any self-hosted runner]
    C --> D[macOS EC2 runner\nec2-user home: /Users/ec2-user]
    C --> E[Linux runner]
    D --> F["❌ mkdir: /Users/runner: Permission denied\nWorkflow fails"]
    E --> G[✅ Workflow succeeds]
    B -- "After: runs-on: [self-hosted, Linux]" --> H[Linux runner only]
    H --> I[✅ Workflow succeeds]

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_{Reviews (3): Last reviewed commit: "Merge branch 'dev' into fix/code-cleanup..." | Re-trigger Greptile}