ci: add secret scanning

.github/workflows/python-ci.yml

@@ -9,6 +9,20 @@ on:
     - cron: '0 3 * * *'
 
 jobs:
+  secret-scan:
+    name: Secret Scan
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request' || github.event_name == 'schedule'
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Run gitleaks
+        uses: gitleaks/gitleaks-action@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITLEAKS_CONFIG: .gitleaks.toml
+
   build:
     strategy:
       matrix: