Add EESSI test to CI workflow

Author: Scott Davidson

.github/workflows/stackhpc.yml

@@ -99,6 +99,12 @@ jobs:
           . environments/.stackhpc/activate
           ansible-playbook -vv ansible/adhoc/hpctests.yml
 
+      - name: Run EESSI tests
+        run: |
+          . venv/bin/activate
+          . environments/.stackhpc/activate
+          ansible-playbook -vv ansible/ci/check_eessi.yml
+
       - name: Confirm Open Ondemand is up (via SOCKS proxy)
         run: |
           . venv/bin/activate