Add GitHub Actions workflow to run Bandit and upload SARIF security reports

- Added a GitHub Actions workflow that runs Bandit on the LiveInternetSpeedTester plugin source code.
- Bandit scans for common Python security issues with medium severity and high confidence.
- The workflow generates a SARIF report and uploads it to GitHub’s Security tab under Code Scanning Alerts.
- Scheduled to run every Thursday at 18:39 UTC, and also runs on push and pull requests to the main branch.

Directory scanned:
  ./addon/globalPlugins/LiveInternetSpeedTester

Author: swarup-developer

.github/workflows/bandit.yml

@@ -0,0 +1,37 @@
+# GitHub Actions workflow to run Bandit and upload SARIF report to Security tab
+
+name: Bandit Security Scan
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '39 18 * * 4' # Every Thursday at 18:39 UTC
+
+jobs:
+  bandit:
+    name: Run Bandit on LiveInternetSpeedTester
+    permissions:
+      contents: read
+      security-events: write
+      actions: read
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Install Bandit
+        run: pip install bandit
+
+      - name: Run Bandit with SARIF output
+        run: |
+          bandit -r addon/globalPlugins/LiveInternetSpeedTester -f sarif -o bandit-results.sarif --severity-level medium --confidence-level high
+
+      - name: Upload SARIF file to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: bandit-results.sarif