ci: Set up CodeQL scanning (#29)

Author: jbeckwith-oai

.github/workflows/codeql.yml

@@ -0,0 +1,43 @@
+name: CodeQL
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions: {}
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - language: actions
+            build-mode: none
+          - language: go
+            build-mode: autobuild
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          persist-credentials: false
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@f52b05f4acaaa234e44466e66d29050e135ea9ef # v4.36.0
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: ${{ matrix.build-mode }}
+
+      - name: Analyze
+        uses: github/codeql-action/analyze@f52b05f4acaaa234e44466e66d29050e135ea9ef # v4.36.0