Use specific php version.

.github/workflows/gh-actions.yml

@@ -20,6 +20,8 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
     - name: Setup PHP, with composer and extensions
+      with:
+        php-version: ${{ matrix.php-versions }}
       uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
     - name: Get composer cache directory
       id: composercache
@@ -27,6 +29,7 @@ jobs:
     - name: Cache composer dependencies
       uses: actions/cache@v2
       with:
+        php-version: ${{ matrix.php-versions }}
         path: ${{ steps.composercache.outputs.dir }}
         key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
         restore-keys: ${{ runner.os }}-composer-