add listen.dev github actions file

.github/workflows/lstn.yml

@@ -0,0 +1,21 @@
+name: listen.dev Vulnerability Check
+on:
+  workflow_dispatch: {}
+  pull_request: {}
+  push:
+    branches:
+      - develop
+
+jobs:
+  listen_dev:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Run listen.dev Scan
+      uses: listendev/[email protected]
+      with: 
+        jwt: ${{ secrets.LSTN_API_KEY }}
+        ci: only