Merge pull request #598 from balakrishna-deriv/fix-ga-vulnerability

Bala/Fix head sha in workflow

Author: balakrishna-deriv

.github/workflows/generate_preview_link.yml

@@ -29,12 +29,12 @@ jobs:
         uses: "deriv-com/shared-actions/.github/actions/post_preview_build_comment@v1"
         with:
           issue_number: ${{github.event.number}}
-          head_sha: ${{github.event.workflow_run.head_sha}}
+          head_sha: ${{github.event.pull_request.head.sha}}
 
       - name: Checkout
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
         with:
-          ref: ${{ github.event.workflow_run.head_sha }}
+          ref: ${{github.event.pull_request.head.sha}}
 
       - name: Setup Node
         uses: actions/setup-node@f1f314fca9dfce2769ece7d933488f076716723e