define expected EB versions per EESSI version

Author: bedroge

.github/workflows/tests_init_module.yml

@@ -18,6 +18,11 @@ jobs:
           - '2025.06'
         EESSI_SOFTWARE_SUBDIR_OVERRIDE:
           - x86_64/intel/haswell
+        include:
+          - EESSI_VERSION: '2023.06'
+            EXPECTED_EASYBUILD_VERSION: '5.0.0'
+          - EESSI_VERSION: '2025.06'
+            EXPECTED_EASYBUILD_VERSION: '5.1.1'
     steps:
       - name: Check out software-layer repository
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1