[TASK] Move the coverage generation to a separate CI job

This makes the CI configuration easier to understand.

.github/workflows/ci.yml

@@ -39,11 +39,50 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-version: [ '7.2', '7.3' ]
-        coverage: [ 'none' ]
-        include:
-          - php-version: '7.4'
-            coverage: xdebug
+        php-version: [ '7.2', '7.3', '7.4' ]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          ini-values: error_reporting=E_ALL
+          tools: composer:v2
+          coverage: none
+
+      - name: Show the Composer configuration
+        run: composer config --global --list
+
+      - name: Cache dependencies installed with composer
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/composer
+          key: php${{ matrix.php-version }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: |
+            php${{ matrix.php-version }}-composer-
+
+      - name: Install Composer dependencies
+        run: |
+          composer update --with-dependencies --no-progress;
+          composer show;
+
+      - name: Run Tests
+        run: ./vendor/bin/phpunit --coverage-clover build/coverage/xml
+
+  coverage:
+    name: Coverage
+
+    runs-on: ubuntu-22.04
+
+    needs: [ php-lint ]
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version: [ '7.4' ]
 
     steps:
       - name: Checkout
@@ -55,7 +94,7 @@ jobs:
           php-version: ${{ matrix.php-version }}
           ini-values: error_reporting=E_ALL
           tools: composer:v2
-          coverage: "${{ matrix.coverage }}"
+          coverage: xdebug
 
       - name: Show the Composer configuration
         run: composer config --global --list
@@ -79,7 +118,7 @@ jobs:
       - name: Upload coverage results to Codacy
         env:
           CODACY_PROJECT_TOKEN: ${{ secrets.CODACY_PROJECT_TOKEN }}
-        if: "${{ matrix.coverage != 'none' && env.CODACY_PROJECT_TOKEN != '' }}"
+        if: "${{ env.CODACY_PROJECT_TOKEN != '' }}"
         run: |
           ./vendor/bin/codacycoverage clover build/coverage/xml