Creating github workflow

.github/workflows/php.yml

@@ -0,0 +1,39 @@
+name: Build
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version: [7.4, 8.0, 8.1, 8.2]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          coverage: none
+
+      - name: Validate composer.json
+        run: composer validate --no-check-all --strict
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Run phpstan
+        run: composer run-script phpstan
+
+      - name: Run test suite
+        run: composer run-script test