Added additional information to pipeline trigger

Signed-off-by: Philip Windecker <philip.windecker@avenyr.de>

Author: philipwindecker

.github/workflows/antora-build.yml

@@ -19,7 +19,7 @@ jobs:
         token: ${{ secrets.MACHINE_USER_PAT }}
         event-type: antora-build-trigger
         repository: OpenSimulationInterface/osi-antora-generator
-        client-payload: '{"src": "${{ github.repository }}", "ref": "${{ github.ref }}", "sha": "${{ github.sha }}"}'
+        client-payload: '{"src": "${{ github.repository }}", "ref": "${{ github.ref }}", "sha": "${{ github.sha }}", "head_ref": "${{ github.head_ref }}"}'
   # antora-build:
   #   name: Build
   #   runs-on: ubuntu-20.04