define python version var at workflow level for testing rebuild

Author: bertiethorpe

.github/workflows/stackhpc.yml

@@ -32,6 +32,7 @@ jobs:
       CI_CLOUD: ${{ vars.CI_CLOUD }} # default from repo settings
       TF_VAR_os_version: ${{ matrix.os_version }}
       STACKHPC_TF_DIR: environments/.stackhpc/tofu
+      PYTHON_VERSION: /usr/bin/python3.12 # needed for rebuild testing
     steps:
 
       - name: Find the latest release