From a015aaefe378e405ffdb7a866ed192bbc63aa007 Mon Sep 17 00:00:00 2001
From: Filipe Moreira <xfilipepenna2@gmail.com>
Date: Fri, 25 Sep 2026 16:32:09 -0300
Subject: [PATCH] ci: enable Dependabot (monthly, grouped) and CodeQL

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 .github/dependabot.yml       | 25 +++++++++++++++++++++
 .github/workflows/codeql.yml | 42 ++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 .github/dependabot.yml
 create mode 100644 .github/workflows/codeql.yml

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..503fa9d
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,25 @@
+# Monthly, grouped dependency updates: at most one PR per ecosystem per month.
+# The CI workflow builds and tests each PR on Windows before merge.
+version: 2
+updates:
+  - package-ecosystem: nuget
+    directory: "/"
+    schedule:
+      interval: monthly
+    open-pull-requests-limit: 2
+    groups:
+      nuget:
+        patterns: ["*"]
+    commit-message:
+      prefix: "chore(deps)"
+
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: monthly
+    open-pull-requests-limit: 2
+    groups:
+      actions:
+        patterns: ["*"]
+    commit-message:
+      prefix: "ci(deps)"
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..344a076
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,42 @@
+name: CodeQL
+
+# Security analysis (free for public repos). C# is analysed without building
+# (build-mode: none), so it runs on Linux; the workflows are analysed too.
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+  schedule:
+    - cron: "23 6 * * 1"
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [csharp, actions]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: none
+
+      - name: Analyze
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{ matrix.language }}"