Merge branch 'sh-enable-redis-key-compression' into 'master'

Enable Redis cache key compression

Closes #198586

See merge request gitlab-org/gitlab!27254

changelogs/unreleased/sh-enable-redis-key-compression.yml

+---
+title: Enable Redis cache key compression
+merge_request: 27254
+author:
+type: performance

config/application.rb

@@ -258,7 +258,7 @@ module Gitlab
     # Full list of options:
     # https://api.rubyonrails.org/classes/ActiveSupport/Cache/RedisCacheStore.html#method-c-new
     caching_config_hash = Gitlab::Redis::Cache.params
-    caching_config_hash[:compress] = false
+    caching_config_hash[:compress] = Gitlab::Utils.to_boolean(ENV.fetch('ENABLE_REDIS_CACHE_COMPRESSION', '1'))
     caching_config_hash[:namespace] = Gitlab::Redis::Cache::CACHE_NAMESPACE
     caching_config_hash[:expires_in] = 2.weeks # Cache should not grow forever
     if Gitlab::Runtime.multi_threaded?