Mount EESSI to be able to run script

Author: ocaisa

.github/workflows/test_overview_available_software.yml

@@ -17,6 +17,11 @@ jobs:
           python-version: '3.10'
           architecture: x64
 
+      - name: Mount EESSI
+        uses: eessi/github-action-eessi@e1f8f20638ea417a18d23ab29443ee34794ff900 # v3.1.0
+        with:
+          eessi_stack_version: '2023.06'
+
       - name: test overview available software
         id: test_overview_available_software
         run: |