Migrate coverage reporting from Coveralls to Codecov

[Copilot]

• Update .github/workflows/ci.yml: simplified "Run PHPUnit with coverage" step (removed mkdir -p build/logs, changed clover path to clover.xml); replaced "Upload coverage report to Coveralls" step with "Upload coverage to Codecov" using codecov/codecov-action@v5
• Update README.md: replaced Coveralls badge with Codecov badge
• Update composer.json: removed php-coveralls/php-coveralls from require-dev

Original prompt

Migrate from Coveralls to Codecov for coverage reporting, mirroring the changes made in brick/money#115.

Changes required

1. .github/workflows/ci.yml

In the phpunit job, make the following changes:

• In the "Run PHPUnit with coverage" step, change the clover output path from build/logs/clover.xml to clover.xml (and remove the mkdir -p build/logs line, since the file is now written to the root):

  - name: Run PHPUnit with coverage
    run: vendor/bin/phpunit --fail-on-skipped --coverage-clover clover.xml
    env:
      CALCULATOR: ${{ matrix.calculator }}
    if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}

  Note: The current step uses a multi-line run block with mkdir -p build/logs followed by vendor/bin/phpunit --coverage-clover build/logs/clover.xml. Keep the --fail-on-skipped flag if it's present; if not, just change the clover path.

• Replace the "Upload coverage report to Coveralls" step with:

  - name: Upload coverage to Codecov
    uses: codecov/codecov-action@v5
    env:
      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
    if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}

  (Remove the old step that runs vendor/bin/php-coveralls with COVERALLS_REPO_TOKEN.)

Here is the current full content of .github/workflows/ci.yml for reference:

name: CI

on:
  push:
  pull_request:

env:
  PHPSTAN_PHP_VERSION: "8.4"
  COVERAGE_PHP_VERSION: "8.4"

jobs:
  phpstan:
    name: PHPStan
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup PHP
        uses: shivammathur/setup-php@v2
        with:
          php-version: ${{ env.PHPSTAN_PHP_VERSION }}

      - name: Install composer dependencies
        uses: ramsey/composer-install@v3

      - name: Run PHPStan
        run: vendor/bin/phpstan --no-progress

  coding-standard:
    name: Coding Standard
    uses: brick/coding-standard/.github/workflows/coding-standard.yml@v4
    with:
      php-version: "8.2"
      working-directory: "tools/ecs"

  phpunit:
    name: PHPUnit
    runs-on: ubuntu-latest

    strategy:
      fail-fast: false
      matrix:
        php-version:
          - "8.2"
          - "8.3"
          - "8.4"
          - "8.5"
        calculator:
          - GMP
          - BCMath
          - Native
        deps:
          - "highest"
        include:
          - php-version: "8.2"
            calculator: GMP
            deps: "lowest"
          - php-version: "8.2"
            calculator: BCMath
            deps: "lowest"
          - php-version: "8.2"
            calculator: Native
            deps: "lowest"

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup PHP
        uses: shivammathur/setup-php@v2
        with:
          php-version: ${{ matrix.php-version }}
          coverage: pcov

      - name: Install composer dependencies
        uses: ramsey/composer-install@v3
        with:
          dependency-versions: ${{ matrix.deps }}

      - name: Run PHPUnit
        run: vendor/bin/phpunit
        env:
          CALCULATOR: ${{ matrix.calculator }}
        if: ${{ matrix.php-version != env.COVERAGE_PHP_VERSION }}

      - name: Run PHPUnit with coverage
        run: |
          mkdir -p build/logs
          vendor/bin/phpunit --coverage-clover build/logs/clover.xml
        env:
          CALCULATOR: ${{ matrix.calculator }}
        if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}

      - name: Run PHPUnit with bcscale()
        run: vendor/bin/phpunit
        env:
          CALCULATOR: BCMath
          BCMATH_DEFAULT_SCALE: 8
        if: ${{ matrix.calculator == 'BCMath' }}

      - name: Upload coverage report to Coveralls
        run: vendor/bin/php-coveralls --coverage_clover=build/logs/clover.xml -v
        env:
          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}

The updated file should replace the last two steps (Run PHPUnit with coverage and Upload coverage report to Coveralls) with:

      - name: Run PHPUnit with coverage
        run: vendor/bin/phpunit --fail-on-skipped --coverage-clover clover.xml
        env:
          CALCULATOR: ${{ matrix.calculator }}
        if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}

      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v5
        env:
          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
        if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}

2. README.md

Replace the Coveralls badge with a Codecov badge:

• Remove:

  [![Coverage Status](https://coveralls.io/repos/github/brick/math/badge.svg?branch=master)](https://coveralls.io/github/brick/math?branch=master)
  

• Add:

  [![Coverage](https://codecov.io/github/brick/math/graph/badge.svg)](https://codecov.io/github...
  
  

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[codecov]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered ☂️

[BenMorel]

@copilot Do not add fail-on-skipped if it was not already there.

[Copilot]

@copilot Do not add fail-on-skipped if it was not already there.

Removed in 7ce4383.