Fix GitHub actions config

Author: javiereguiluz

.github/workflows/ci.yaml

@@ -13,14 +13,19 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            -   name: Set PHP Version
-                run: sudo update-alternatives --set php /usr/bin/php7.4
+            - name: 'Checkout code'
+              uses: actions/checkout@v3
 
-            -   name: Checkout
-                uses: actions/checkout@v2
+            - name: 'Install PHP'
+              uses: shivammathur/setup-php@v2
+              with:
+                  coverage: none
+                  php-version: 7.4
+                  tools: composer:v2
+                  ini-values: date.timezone=UTC
 
-            -   name: Validate
-                run: composer validate --strict
+            - name: Validate composer.json file
+              run: composer validate --strict
 
     stable-tests:
         name: Stable Tests
@@ -29,27 +34,19 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php-versions: [ '7.4', '8.0' ]
+                php-version: ['7.4', '8.0']
 
         steps:
-            -   name: Set PHP Version
-                run: sudo update-alternatives --set php /usr/bin/php${{ matrix.php-versions }}
-
-            -   name: Get PHP Version
-                run: |
-                    ver=$(php -v | grep -oP '(?<=PHP )\d.\d')
-                    echo "::set-output name=version::$ver"
-                id: php-ver
-
-            -   name: Using PHP Version from matrix
-                run: |
-                    echo "Runner is not using PHP Version defined in the php-versions matrix."
-                    php -v
-                    exit 1
-                if: steps.php-ver.outputs.version != matrix.php-versions
-
-            -   name: Checkout
-                uses: actions/checkout@v2
+            - name: 'Checkout code'
+              uses: actions/checkout@v3
+
+            - name: 'Install PHP'
+              uses: shivammathur/setup-php@v2
+              with:
+                  coverage: none
+                  php-version: ${{ matrix.php-version }}
+                  tools: composer:v2
+                  ini-values: date.timezone=UTC
 
             -   name: Install Composer Dependencies
                 run: composer install --no-progress