Include PHPStan testing in actions

.editorconfig

@@ -6,4 +6,7 @@ end_of_line = lf
 indent_style = space
 indent_size = 4
 trim_trailing_whitespace = true
-insert_final_newline = true
+insert_final_newline = true
+
+[.github/workflows/**.{yml,yaml}]
+indent_size = 2

.github/workflows/tests.yml

@@ -9,7 +9,6 @@ on:
 jobs:
   unitTests:
     strategy:
-      max-parallel: 4
       matrix:
         operatingSystem: [ubuntu-latest, windows-latest]
         phpVersion: ['8.1', '8.2', '8.3']
@@ -56,3 +55,42 @@ jobs:
 
       - name: Run tests
         run: composer run test
+
+  staticAnalysis:
+    runs-on: ubuntu-latest
+    name: Static Analysis
+    env:
+      extensions: curl, fileinfo, openssl, zip
+      key: winter-packager-v1
+
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}-phpstan
+      cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+    steps:
+      - name: Checkout changes
+        uses: actions/checkout@v4
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+          tools: composer:v2
+          extensions: ${{ env.extensions }}
+
+      - name: Setup dependency cache
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install Composer dependencies
+        run: composer install --no-interaction --no-progress --no-scripts
+
+      - name: Run tests
+        run: ./vendor/bin/phpstan analyse