feat(ci): add gitleaks

Signed-off-by: Cattī Crūdēlēs <[email protected]>

.github/workflows/gitleaks.yml

@@ -0,0 +1,15 @@
+name: gitleaks
+on: [ pull_request, push, workflow_dispatch ]
+jobs:
+  scan:
+    name: gitleaks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: gitleaks/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITLEAKS_LICENSE: ${{ secrets.GITLEAKS_LICENSE}} # Only required for Organizations, not personal accounts.
+