refactor: replace ubuntu-latest with ubuntu-slim in lightweight workflows

[Copilot]

Reduces runner startup time and resource consumption by switching lightweight automation workflows to ubuntu-slim.

Changes

• Updated 5 simple workflows to use ubuntu-slim:

  • auto-assign-pr.yml - PR author assignment
  • label.yml - PR labeling
  • merge-conflict-autolabel.yml - Conflict detection
  • semantic-pr.yml - PR title validation
  • github-projects.yml - Project board automation

• Preserved ubuntu-latest in ci.yml (build/test/lint workflow requires full environment)

jobs:
  assign-author:
    name: 'Pull request assignment'
-   runs-on: ubuntu-latest
+   runs-on: ubuntu-slim
    steps:
      - uses: toshimaru/[email protected]

Original prompt

Replace ubuntu-latest with ubuntu-slim across all listed GitHub Actions workflows to reduce runner startup time and resource consumption. Do not replace for complex workflows that may require a lot of memory. Below a list of workflows that are definitely safe (from the openfoodfacts-server, names and workflows may vary based on the repo where we're running this refactor task)

auto-assign-pr.yml
codeql-analysis.yml
crowdin-per-language.yml
crowdin.yml
generate-doc.yml
github-projects-ventilation.yml
label.yml
merge-conflict-autolabel.yml
pr_actions.yml
release-please.yml
semantic-pr.yml
top-issues.yml
translation-check.yml

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Project	Deployment	Preview	Comments	Updated (UTC)
explorer	Ready	Preview	Comment	Nov 1, 2025 0:18am