False positive for the rule `actions/pr-on-self-hosted-runner`

Empieza reproduciendo la alerta actions/pr-on-self-hosted-runner con el workflow runs-on basado en expresiones que se muestra en el issue. Localiza la implementación de la regla y sus pruebas, y después actualiza el comportamiento para que esta expresión que selecciona windows-latest o ubuntu-latest no se marque como self-hosted; añade o ajusta una prueba de regresión y verifica que la alerta haya desaparecido.

Description of the false positive

False positive for the rule actions/pr-on-self-hosted-runner when runs-on is an expression.

We have an expression for whether the job runs on windows-latest or ubuntu-latest. Neither are self hosted.

    runs-on: ${{ ((matrix.language == 'c-cpp' || matrix.language == 'csharp') && 'windows-latest') || 'ubuntu-latest' }}

Code samples or links to source code

name: "CodeQL Advanced"

on:
  push:
    branches: [ "master" ]
  pull_request:
    branches: [ "master" ]
  schedule:
    - cron: '42 8 * * 4'
  workflow_dispatch:

jobs:
  analyze:
    name: Analyze (${{ matrix.language }})
    # Runner size impacts CodeQL analysis time. To learn more, please see:
    #   - https://gh.io/recommended-hardware-resources-for-running-codeql
    #   - https://gh.io/supported-runners-and-hardware-resources
    #   - https://gh.io/using-larger-runners (GitHub.com only)
    # Consider using larger runners or machines with greater resources for possible analysis time improvements.
    runs-on: ${{ ((matrix.language == 'c-cpp' || matrix.language == 'csharp') && 'windows-latest') || 'ubuntu-latest' }}
    env:
      CONAN_PASSWORD: ${{ secrets.RHAPSODY_ARTIFACTORY_KEY }}
      CONAN_LOGIN_USERNAME: ${{ vars.RHAPSODY_ARTIFACTORY_USER }}

    permissions:
      # required for all workflows
      security-events: write

      # required to fetch internal or private CodeQL packs
      packages: read

      # only required for workflows in private repositories
      actions: read
      contents: read

    strategy:
      fail-fast: false
      matrix:
        include:
        - language: actions
          build-mode: none
          queries: actions-all
        - language: c-cpp
          build-mode: manual
        - language: csharp
          build-mode: manual
        - language: java-kotlin
          build-mode: none # This mode only analyzes Java. Set this to 'autobuild' or 'manual' to analyze Kotlin too.
        - language: javascript-typescript
          build-mode: none
        - language: python
          build-mode: none
        # CodeQL supports the following values keywords for 'language': 'actions', 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'swift'
        # Use `c-cpp` to analyze code written in C, C++ or both
        # Use 'java-kotlin' to analyze code written in Java, Kotlin or both
        # Use 'javascript-typescript' to analyze code written in JavaScript, TypeScript or both
        # To learn more about changing the languages that are analyzed or customizing the build mode for your analysis,
        # see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning.
        # If you are analyzing a compiled language, you can modify the 'build-mode' for that language to customize how
        # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4

    # Add any setup steps before running the `github/codeql-action/init` action.
    # This includes steps like installing compilers or runtimes (`actions/setup-node`
    # or others). This is typically only required for manual builds.
    # - name: Setup runtime (example)
    #   uses: actions/setup-example@v1

    # Initializes the CodeQL tools for scanning.
    - name: Initialize CodeQL
      uses: github/codeql-action/init@v3
      with:
        languages: ${{ matrix.language }}
        build-mode: ${{ matrix.build-mode }}
        queries: ${{ matrix.queries }}
        # If you wish to specify custom queries, you can do so here or in a config file.
        # By default, queries listed here will override any specified in a config file.
        # Prefix the list here with "+" to use these queries and those in the config file.

        # For more details on CodeQL's query packs, refer to: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
        # queries: security-extended,security-and-quality

    - name: Perform CodeQL Analysis
      uses: github/codeql-action/analyze@v3
      with:
        category: "/language:${{matrix.language}}"

URL to the alert on GitHub code scanning (optional)