add GH CI

Author: efureev

.github/workflows/php.yml

@@ -37,13 +37,13 @@ jobs:
       fail-fast: false
       matrix:
         setup: [ 'basic', 'lowest', 'stable' ]
-        php: [ '8.0' ]
+        php: [ '8.0', '8.1' ]
 
     steps:
       - uses: actions/checkout@v2
 
       - name: Use PHP ${{ matrix.php }}
-        uses: shivammathur/setup-php@v1 # Action page: <https://github.com/shivammathur/setup-php>
+        uses: shivammathur/setup-php@v2 # Action page: <https://github.com/shivammathur/setup-php>
         with:
           php-version: ${{ matrix.php }}
           extensions: mbstring