fix regex to find the custom EESSI version in the output of --list-repos

Author: bedroge

.github/workflows/test_eessi_container_script.yml

@@ -58,11 +58,12 @@ jobs:
                 echo "[EESSI/20HT.TP]" >> cfg/repos.cfg
                 echo "repo_version = 20HT.TP" >> cfg/repos.cfg
                 ./eessi_container.sh --verbose --list-repos | tee ${outfile}
-                grep "EESSI" ${outfile}
+                # make sure that the default EESSI software repository is available
+                grep "software.eessi.io" ${outfile}
 
                 export EESSI_REPOS_CFG_DIR_OVERRIDE=${PWD}/cfg
                 ./eessi_container.sh --verbose --list-repos | tee ${outfile2}
-                grep "[EESSI/2023.02]" ${outfile2}
+                grep "EESSI/20AB.CD" ${outfile2}
 
               # test use of --mode run
               elif [[ ${{matrix.SCRIPT_TEST}} == 'run' ]]; then