ci: add synk for security scannling

adding sync github action to
run when a PR is merged to the branch,
This will help us to track the security
scanning results and fix if anything is
required and also it serves as a placeholder
for security scanning result for a while.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

.github/workflows/snyk.yaml

@@ -0,0 +1,26 @@
+name: Security scanning
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - devel
+      - release-*
+
+permissions:
+  contents: read
+
+jobs:
+  security:
+    if: github.repository == 'ceph/ceph-csi'
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: run Snyk to check for code vulnerabilities
+        uses: snyk/actions/golang@master
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}