Dockerfile don't install the redis package

Ref: rails#46953

None of the Ruby redis client need that package.

Author: byroot

railties/lib/rails/generators/app_base.rb

@@ -506,9 +506,6 @@ def dockerfile_build_packages
         # add databases: sqlite3, postgres, mysql
         packages += %w(pkg-config libpq-dev default-libmysqlclient-dev)
 
-        # add redis in case Action Cable, caching, or sidekiq are added later
-        packages << "redis"
-
         # ActiveStorage preview support
         packages << "libvips" unless skip_active_storage?
 
@@ -543,9 +540,6 @@ def dockerfile_deploy_packages
         # start with databases: sqlite3, postgres, mysql
         packages = %w(libsqlite3-0 postgresql-client default-mysql-client)
 
-        # add redis in case Action Cable, caching, or sidekiq are added later
-        packages << "redis"
-
         # ActiveStorage preview support
         packages << "libvips" unless skip_active_storage?