Use github token

Author: MoteHue

.github/workflows/trigger-overcloud-host-image-build.yml

@@ -37,6 +37,7 @@ jobs:
           --repo stackhpc/stackhpc-kayobe-config \
           --ref $BRANCH_NAME
         env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
 
       - name: Display link to overcloud host image build workflows