chore: add gitleaks workflow

.github/workflows/gitleaks.yaml

@@ -0,0 +1,22 @@
+---
+name: gitleaks
+
+on:
+  - pull_request
+  - push
+  - workflow_dispatch
+
+permissions:
+  contents: read
+
+jobs:
+  scan:
+    name: gitleaks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: gitleaks/gitleaks-action@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}