ci: add codeql action

Adding codeql for github actions similar to sdk-nrf.

Signed-off-by: Kari Hamalainen <kari.hamalainen@nordicsemi.no>

Author: karhama

.github/codeql/codeql-actions-config.yml

@@ -0,0 +1,2 @@
+paths:
+  - .github

.github/workflows/codeql.yml

@@ -0,0 +1,37 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches:
+      - main
+      - v*-branch
+  pull_request:
+    branches:
+      - main
+      - v*-branch
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: CodeQL (Github actions)
+    runs-on: ubuntu-24.04
+    permissions:
+      security-events: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@f1f6e5f6af878fb37288ce1c627459e94dbf7d01 # v3.30.1
+        with:
+          languages: actions
+          build-mode: none
+          queries: security-extended
+          config-file: ./.github/codeql/codeql-actions-config.yml
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@f1f6e5f6af878fb37288ce1c627459e94dbf7d01 # v3.30.1
+        with:
+          category: "/language:actions"