Add CodeQL workflow

.github/workflows/codeql.yml

@@ -0,0 +1,45 @@
+name: Code Scanning
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    paths-ignore:
+      - '**/*.md'
+  schedule:
+    - cron: "0 0 * * 0"
+
+permissions:
+  actions: read  # for github/codeql-action/init to get workflow details
+  contents: read  # for actions/checkout to fetch code
+  security-events: write  # for github/codeql-action/analyze to upload SARIF results
+
+jobs:
+  CodeQL-Build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ['go', 'actions']
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v6
+
+      - name: Setup Go
+        if: matrix.language == 'go'
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: "go.mod"
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: ${{ matrix.language }}
+          queries: security-and-quality
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: "/language:${{ matrix.language }}"