ci(actions): add phpstan action

.github/workflows/analyse.yaml

@@ -0,0 +1,48 @@
+name: Static analysis
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  phpstan:
+    name: PHPStan
+    runs-on: ubuntu-20.04
+    
+    # 'push' runs on inner branches, 'pull_request' will run only on outer PRs
+    if: >
+      github.event_name == 'push'
+      || (github.event_name == 'pull_request'
+          && github.event.pull_request.head.repo.full_name != github.repository)
+
+    permissions:
+      contents: read
+    steps:
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.2"
+          extensions: gd, zip, intl, yaml, pdo_mysql, rdkafka, imagick
+          tools: composer:v2
+          coverage: none
+
+      - name: Checkout Chandler
+        uses: actions/checkout@v4
+        with:
+          repository: openvk/chandler
+
+      - name: Install Chandler dependencies
+        run: composer install --no-interaction --no-progress --no-suggest --prefer-dist
+
+      - name: Checkout OpenVK
+        uses: actions/checkout@v4
+        with:
+          path: extensions/available/openvk
+
+      - name: Install OpenVK dependencies
+        working-directory: extensions/available/openvk
+        run: composer install --no-interaction --no-progress --no-suggest --prefer-dist
+
+      - name: PHPStan
+        working-directory: extensions/available/openvk
+        run: composer run-script analyse