Add Gitleaks secret scanning workflow

.github/workflows/gitleaks.yml

@@ -0,0 +1,27 @@
+name: Gitleaks
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  scan:
+    name: Scan for secrets
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Run Gitleaks
+        uses: gitleaks/gitleaks-action@v3
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Required for organization-owned repositories.
+          GITLEAKS_LICENSE: ${{ secrets.GITLEAKS_LICENSE }}
+          GITLEAKS_ENABLE_COMMENTS: "false"