Added semgrep CI/CD scan

.github/workflows/semgrep.yml

@@ -0,0 +1,19 @@
+name: Semgrep
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  semgrep:
+    name: Run Semgrep 
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    container:
+      # A Docker image with Semgrep installed. Do not change this.
+      image: returntocorp/semgrep
+    if: (github.actor != 'dependabot[bot]')
+    steps:
+      - uses: actions/checkout@v4
+      - run: semgrep ci
+        env:
+          SEMGREP_APP_TOKEN: ${{ secrets.SEMGREP_APP_TOKEN }}