provide & record CI_CLOUD in workflow environment

Author: sjpb

.github/workflows/stackhpc.yml

@@ -15,9 +15,14 @@ jobs:
       ANSIBLE_FORCE_COLOR: True
       OS_CLOUD: openstack
       TF_VAR_cluster_name: ci${{ github.run_id }}
+      CI_CLOUD: ${{ vars.CI_CLOUD }}
     steps:
       - uses: actions/checkout@v2
 
+      - name: Record which cloud CI is running on
+        run: |
+          echo CI_CLOUD: ${{ vars.CI_CLOUD }}
+
       - name: Setup ssh
         run: |
           set -x