Use ubuntu-slim runner for lightweight CI jobs (#2869)

* Use ubuntu-slim runner for lightweight CI jobs Switch 9 jobs across 8 workflow files to use the new ubuntu-slim runner (1 vCPU) instead of ubuntu-latest for cost savings. These jobs only perform lightweight operations like GitHub API calls, JSON validation, spellchecking, and git operations. Jobs updated: - pr-size-labeler: calculate-pr-size - pr-size-label-apply: apply-size-label, enforce-xl-justification - validate-proposal-naming: validate-proposal-naming - spellcheck: codespell - update-docs-website: trigger-docs-update - update-registry: update-registry - releaser: compute-build-flags - renovate-config-validation: validate-renovate-config Reference: https://github.blog/changelog/2025-10-28-1-vcpu-linux-runner-now-available-in-github-actions-in-public-preview/ 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * Revert spellcheck to ubuntu-latest (needs Docker) The codespell action uses a Dockerfile and requires Docker which is not available on ubuntu-slim runners. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>

Author: JAORMX

.github/workflows/pr-size-label-apply.yml

@@ -12,7 +12,7 @@ permissions:
 jobs:
  apply-size-label:
  name: Apply Size Label
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
  if: github.event.workflow_run.conclusion == 'success'
  steps:
  - name: Download artifact
@@ -79,7 +79,7 @@ jobs:
 
  enforce-xl-justification:
  name: Enforce XL PR Justification
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
  if: github.event.workflow_run.conclusion == 'success'
  steps:
  - name: Checkout repository

.github/workflows/pr-size-labeler.yml

@@ -10,7 +10,7 @@ permissions:
 jobs:
  calculate-pr-size:
  name: Calculate PR Size
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
  steps:
  - name: Get PR details
  id: pr

.github/workflows/releaser.yml

@@ -32,7 +32,7 @@ permissions:
 jobs:
  compute-build-flags:
  name: Compute Build Flags
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
  outputs:
  commit-date: ${{ steps.ldflags.outputs.commit-date }}
  commit: ${{ steps.ldflags.outputs.commit }}

.github/workflows/renovate-config-validation.yml

@@ -20,7 +20,7 @@ permissions:
 jobs:
  validate-renovate-config:
  name: Validate Renovate Configuration
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
  steps:
  - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 

.github/workflows/update-docs-website.yml

@@ -16,7 +16,7 @@ on:
 jobs:
  trigger-docs-update:
  name: Trigger Documentation Update
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
 
  steps:
  - name: Trigger docs update workflow

.github/workflows/update-registry.yml

@@ -14,7 +14,7 @@ permissions:
 jobs:
  update-registry:
  name: Update Registry
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
  steps:
  - name: Checkout repository
  uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6

.github/workflows/validate-proposal-naming.yml

@@ -16,7 +16,7 @@ on:
 
 jobs:
  validate-proposal-naming:
- runs-on: ubuntu-latest
+ runs-on: ubuntu-slim
  steps:
  - name: Checkout code
  uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6