CI: "Changed directories" don't parse all directories correctly

[garciagenrique]

This only happens when changes in vre-singleuser and vre-singleuser-* directories happen simultaneously.

Why ?
Github Actions variables are not real bash objects.

Priority ?
Low. Users are not expected to change vre-singleuser, thus this situation will rarely happen.

example of issue: https://github.com/vre-hub/environments/actions/runs/5659959759/job/15334606680

environments=()
  for dir in vre-singleuser-py38 vre-singleuser-root vre-singleuser; do
    echo "$dir was changed"
    if [[ $(echo ${environments[@]} | fgrep -w ${dir}) ]]; then
      echo " - ${dir} is in the list of changed dirs"
    else
      echo " - ${dir} is NOT in the list of changed dirs. Adding it!"
      environments+=("\"${dir}\"")
      echo " ** The update list is ${environments[@]}"
    fi        
  done
  
  ENVS_LIST=`echo "[${environments[@]}]" |  sed 's/ /,/g'`
  echo ::set-output name=environment_list::$ENVS_LIST
  
  echo "The final list is: ${ENVS_LIST}"

Will give as output

vre-singleuser-py38 was changed
 - vre-singleuser-py38 is NOT in the list of changed dirs. Adding it!
 ** The update list is "vre-singleuser-py38"
vre-singleuser-root was changed
 - vre-singleuser-root is NOT in the list of changed dirs. Adding it!
 ** The update list is "vre-singleuser-py38" "vre-singleuser-root"
vre-singleuser was changed
 - vre-singleuser is in the list of changed dirs
The final list is: ["vre-singleuser-py38","vre-singleuser-root"]

vre-singleuser is NOT a substring of vre-singleuser-py38 when run on bash.