add manually run (#624)

Signed-off-by: Fedor Partanskiy <fredprtnsk@gmail.com>

Author: pfi79

.github/workflows/vulnerability-scan.yml

@@ -21,7 +21,7 @@ permissions:
 
 jobs:
   scan-scheduled:
-    if: ${{ github.event_name == 'push' || github.event_name == 'schedule' }}
+    if: ${{ github.event_name == 'push' || github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
     uses: "google/osv-scanner-action/.github/workflows/osv-scanner-reusable.yml@v2.0.1"
   scan-pr:
     if: ${{ github.event_name == 'pull_request' || github.event_name == 'merge_group' }}