ci(scan): add CodeQL source code scan

.github/codeql/codeql-config.yml

@@ -0,0 +1,11 @@
+ame: "CodeQL config"
+
+queries:
+  - uses: security-and-quality
+
+paths:
+  - 'unblob'
+  - 'tests'
+
+paths-ignore:
+  - 'tests/integration/**/*'

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,50 @@
+name: "CodeQL Scan"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    - cron: '20 8 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'python' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        config-file: ./.github/codeql/codeql-config.yml
+        languages: ${{ matrix.language }}
+        # Override the default behavior so that the action doesn't attempt
+        # to auto-install Python dependencies
+        setup-python-dependencies: false
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2