Add static analysis

.github/workflows/static.yaml

@@ -0,0 +1,69 @@
+name: Static analysis
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  phpstan:
+    name: PHPStan
+    runs-on: 'ubuntu-latest'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+          coverage: none
+          tools: phpstan:0.12.92, cs2pr
+
+      - name: Download dependencies
+        uses: ramsey/composer-install@v1
+
+      - name: PHPStan
+        run: phpstan analyze --no-progress --error-format=checkstyle | cs2pr
+
+  php-cs-fixer:
+    name: PHP-CS-Fixer
+    runs-on: 'ubuntu-latest'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+          coverage: none
+          tools: php-cs-fixer:3.9.5, cs2pr
+
+      - name: PHP-CS-Fixer
+        run: php-cs-fixer fix --dry-run --format=checkstyle | cs2pr
+
+  psalm:
+    name: Psalm
+    runs-on: 'ubuntu-latest'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+          coverage: none
+          tools: vimeo/psalm:4.8.1
+
+      - name: Download dependencies
+        uses: ramsey/composer-install@v1
+
+      - name: Psalm
+        run: psalm --no-progress --output-format=github