Add GH Actions CI

.github/workflows/php.yml

@@ -0,0 +1,62 @@
+name: Test & static analysis
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  phpstan:
+    runs-on: "ubuntu-latest"
+
+    steps:
+    - name: "Checkout code"
+      uses: "actions/checkout@v4"
+
+    - name: "Install PHP"
+      uses: "shivammathur/setup-php@v2"
+      with:
+        php-version: "8.3"
+
+    - name: "Install dependencies with Composer"
+      uses: "ramsey/composer-install@v2"
+
+    - name: "Run a static analysis with phpstan/phpstan"
+      run: "vendor/bin/phpstan analyse --memory-limit=2G"
+
+  phpcs:
+    runs-on: "ubuntu-latest"
+
+    steps:
+    - name: "Checkout code"
+      uses: "actions/checkout@v4"
+
+    - name: "Install PHP"
+      uses: "shivammathur/setup-php@v2"
+      with:
+        php-version: "8.3"
+
+    - name: "Install dependencies with Composer"
+      uses: "ramsey/composer-install@v2"
+
+    - name: "Run phpcs"
+      run: "vendor/bin/phpcs"
+
+  phpunit:
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Checkout code"
+        uses: "actions/checkout@v4"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          php-version: "8.3"
+
+      - name: "Install dependencies with Composer"
+        uses: "ramsey/composer-install@v2"
+
+      - name: "Run phpunit"
+        run: "vendor/bin/phpunit"