We can always just specify NEXT_RUBY_VERSION

The default is 3.1.4 if NEXT_RUBY_VERSION is not presented

.gitlab-ci.yml

@@ -30,17 +30,14 @@ default:
 .old-ruby-variables: &old-ruby-variables
   RUBY_VERSION: "3.0"
   CACHE_EDITION: "GITLAB_RUBY3_0"
-  USE_OLD_RUBY_VERSION: "true"
 
 .default-ruby-variables: &default-ruby-variables
   RUBY_VERSION: "3.1"
   CACHE_EDITION: "GITLAB_RUBY3_1"
-  USE_OLD_RUBY_VERSION: "true"
 
 .next-ruby-variables: &next-ruby-variables
   RUBY_VERSION: "3.2"
   CACHE_EDITION: "GITLAB_RUBY3_2"
-  USE_OLD_RUBY_VERSION: "false"
 
 .default-branch-pipeline-failure-variables: &default-branch-pipeline-failure-variables
   CREATE_RAILS_TEST_FAILURE_ISSUES: "true"

.gitlab/ci/qa-common/variables.gitlab-ci.yml

 # Default variables for package-and-test
 
 variables:
-  USE_OLD_RUBY_VERSION: "true"
   REGISTRY_HOST: "registry.gitlab.com"
   REGISTRY_GROUP: "gitlab-org"
   ALLURE_JOB_NAME: $CI_PROJECT_NAME

.gitlab/ci/qa.gitlab-ci.yml

@@ -90,7 +90,6 @@ trigger-omnibus:
     TOP_UPSTREAM_SOURCE_PROJECT: $CI_PROJECT_PATH
     SECURITY_SOURCES: $SECURITY_SOURCES
     CACHE_UPDATE: $OMNIBUS_GITLAB_CACHE_UPDATE
-    USE_OLD_RUBY_VERSION: $USE_OLD_RUBY_VERSION
     CACHE_EDITION: $CACHE_EDITION
     NEXT_RUBY_VERSION: $FULL_RUBY_VERSION
     BUILD_ON_ALL_OS: $OMNIBUS_GITLAB_BUILD_ON_ALL_OS

.gitlab/ci/setup.gitlab-ci.yml

@@ -206,7 +206,6 @@ trigger-omnibus-env:
       echo "OMNIBUS_GITLAB_CACHE_UPDATE=${OMNIBUS_GITLAB_CACHE_UPDATE:-false}" >> $BUILD_ENV
       for version_file in *_VERSION; do echo "$version_file=$(cat $version_file)" >> $BUILD_ENV; done
       echo "OMNIBUS_GITLAB_BUILD_ON_ALL_OS=${OMNIBUS_GITLAB_BUILD_ON_ALL_OS:-false}" >> $BUILD_ENV
-      echo "USE_OLD_RUBY_VERSION=${USE_OLD_RUBY_VERSION:-false}" >> $BUILD_ENV
       ruby -e 'puts "FULL_RUBY_VERSION=#{RUBY_VERSION}"' >> $BUILD_ENV
       echo "GITLAB_ASSETS_TAG=$(assets_image_tag)" >> $BUILD_ENV
       echo "EE=$([[ $FOSS_ONLY == '1' ]] && echo 'false' || echo 'true')" >> $BUILD_ENV