Add GitHub workflows

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+updates:
+  - package-ecosystem: "composer"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    assignees:
+      - "sebastian-meyer"
+    labels: [ ]
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    assignees:
+      - "sebastian-meyer"
+    labels: [ ]

.github/workflows/phpmd.yml

@@ -0,0 +1,40 @@
+name: PHP Mess Detector
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  PHPMD:
+    name: PHPMD Scanner
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+      actions: read
+
+    steps:
+      - name: Checkout Source Code
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.0"
+          coverage: none
+          tools: phpmd
+
+      - name: Run PHPMD
+        run: phpmd . sarif codesize --reportfile phpmd-results.sarif
+        continue-on-error: true
+
+      - name: Upload Analysis Results
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: phpmd-results.sarif
+          wait-for-processing: true

.github/workflows/phpstan.yml

@@ -0,0 +1,35 @@
+name: PHP Static Analyzer
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  PHPStan:
+    name: PHPStan Scanner
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+      actions: read
+
+    steps:
+      - name: Checkout Source Code
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: php-actions/composer@v6
+        with:
+          command: update
+          php_version: "8.0"
+
+      - name: Run PHPStan
+        uses: php-actions/phpstan@v3
+        with:
+          path: src/
+          configuration: phpstan.dist.neon