Add trigger for docs-staging nextgen workflow

Added a step to trigger the nextgen workflow in docs-staging.

Author: shhdgit

.github/workflows/dispatch.yml

@@ -40,3 +40,12 @@ jobs:
           -H "Authorization: token ${{ secrets.DOCS_STAGING }}" \
           https://api.github.com/repos/pingcap/docs-staging/actions/workflows/update.yml/dispatches \
           -d '{"ref":"main","inputs":{"full": "false", "repo":"${{ github.repository }}","branch":"${{ github.ref_name }}"}}'
+      
+      - name: trigger docs-staging nextgen workflow
+        run: |
+          curl \
+          -X POST \
+          -H "Accept: application/vnd.github+json" \
+          -H "Authorization: token ${{ secrets.DOCS_STAGING }}" \
+          https://api.github.com/repos/pingcap/docs-staging/actions/workflows/update-nextgen.yml/dispatches \
+          -d '{"ref":"nextgen","inputs":{"full": "false", "repo":"${{ github.repository }}","branch":"${{ github.ref_name }}"}}'