Add Dependabot configuration and CodeQL analysis workflow

.github/dependabot.yml

@@ -0,0 +1,16 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  # GitHub Actions dependencies
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+    labels:
+      - "github-actions"
+      - "dependencies"

.github/workflows/codeql-analysis.yaml

@@ -0,0 +1,43 @@
+name: "CodeQL Analysis"
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "main", "feature*", "fix*" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '45 1 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'actions' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v6
+      with:
+        persist-credentials: false
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v4
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v4
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v4
+      with:
+        category: "/language:${{ matrix.language }}"