UPD github action to test library

Author: francerz

.github/workflows/phpunit.yml

@@ -1,28 +1,49 @@
 name: PHP Unit Tests
 
-on: [ push ]
+on:
+    push:
+    pull_request:
 
 jobs:
   test:
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        php-version:
+          - '7.4'
+          # - '8.0'
+          # - '8.1'
+          # - '8.2'
+
     steps:
-    - uses: actions/checkout@v2
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-version }}
+        coverage: none
+        tools: composer:v2
 
     - name: Validate composer.json and composer.lock
       run: composer validate
 
-    - name: Caching Composer packages
+    - name: Get Composer cache directory
       id: composer-cache
-      uses: actions/cache@v2
+      run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+    - name: Caching Composer packages
+      uses: actions/cache@v4
       with:
-        path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        path: ${{ steps.composer-cache.outputs.dir }}
+        key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ hashFiles('**/composer.lock') }}
         restore-keys: |
-          ${{ runner.os }}-php-
+          ${{ runner.os }}-php-${{ matrix.php-version }}
 
     - name: Install dependencies
-      run: composer install --prefer-dist --no-progress --no-suggest
+      run: composer install --prefer-dist --no-interaction --no-progress --optimize-autoloader
 
     - name: Run test suite
       run: composer run-script test