Fix cleaning old boxes versions

.github/workflows/build.yml

@@ -155,7 +155,7 @@ jobs:
     steps:
       - name: Remove old versions
         run: |
-          for NAME in ubuntu-18.04-desktop-amd64 ubuntu-{18.04,16.04}-server-amd64 my_ubuntu-18.04-server-amd64 my_centos-7-x86_64 my_windows-10-enterprise-x64-eval windows-{server-{{2016,2012_r2}-standard,2019-datacenter},10-enterprise}-x64-eval; do
+          for NAME in ubuntu-{18,20}.04-desktop-amd64 ubuntu-{20,18,16}.04-server-amd64 my_ubuntu-20.04-server-amd64 my_centos-7-x86_64 my_windows-10-enterprise-x64-eval windows-{server-{{2016,2012_r2}-standard,2019-datacenter},10-enterprise}-x64-eval; do
             OLD_VERSIONS=$(curl -s "https://app.vagrantup.com/api/v1/box/${VAGRANT_CLOUD_USER}/${NAME}" | jq -r '.current_version.version as $current_version | .versions[] | select (.version != $current_version) .version')
             for VERSION in ${OLD_VERSIONS}; do
               echo "*** Removing box version: https://vagrantcloud.com/api/v1/box/${VAGRANT_CLOUD_USER}/${NAME}/version/${VERSION}"
@@ -175,7 +175,7 @@ jobs:
                 echo "* URL \"${URL}\" is not accessible !"
                 exit 1
               fi
-              if [ $(curl -s https://app.vagrantup.com/peru/boxes/${NAME} | jq '.versions | length') != "1" ]; then
+              if [ "$(curl -s "https://app.vagrantup.com/peru/boxes/${NAME}" | jq '.versions | length')" != "1" ]; then
                 echo "* Too many versions for: https://app.vagrantup.com/peru/boxes/${NAME} !"
                 exit 2
               fi