Add CodeQL

Author: Joonas Hiltunen

.github/workflows/codeql.yml

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+name: CodeQL analysis
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: "0 8 * * *" # every day at 8 AM UTC
+
+permissions:
+  security-events: write
+  packages: read
+  contents: read
+  actions: read
+
+jobs:
+  analyze:
+    uses: HSLdevcom/jore4-tools/.github/workflows/shared-codeql.yml@shared-ghas-workflows-v1
+    with:
+      languages: '["actions", "python"]'

.github/workflows/shared-codeql.yml

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+name: Shared CodeQL analysis
+# CodeQL documentation https://github.com/github/codeql-action
+# CodeQL supported languages https://codeql.github.com/docs/codeql-overview/supported-languages-and-frameworks
+# Also see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning#changing-the-languages-that-are-analyzed
+
+on:
+  workflow_call:
+    inputs:
+      languages:
+        description: 'Languages to analyze (JSON array, e.g., ["actions"]). See supported languages at https://codeql.github.com/docs/codeql-overview/supported-languages-and-frameworks'
+        required: true
+        type: string
+
+jobs:
+  analyze:
+    name: Analyze code
+    runs-on: ubuntu-24.04
+    permissions:
+      # required for all workflows
+      security-events: write
+      # required to fetch internal or private CodeQL packs
+      packages: read
+      # only required for workflows in private repositories
+      actions: read
+      # repository contents
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ${{ fromJSON(inputs.languages) }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: "/language:${{matrix.language}}"