Ruby Remote SDK missing teamcity formatter

I'm running a remote SDK in Docker. Despite lacking support, I am very close to having something workable, but I have one issue:

When the SDK is first configured, the IDE installs the teamcity formatter extensions automatically.

When the container is restarted, the installed extensions are lost. The IDE is unaware and does not reinstall them.

How can I force the IDE to reinstall these extensions, or else configure my Dockerfile so that the needed extensions preinstalled?

Pasted error:

/usr/local/bin/ruby -e '$stdout.sync=true;$stderr.sync=true;load($0=ARGV.shift)' /core-service/bin/rspec /core-service/spec/controllers/api/v2/transactions_controller_spec.rb --require teamcity/spec/runner/formatter/teamcity/formatter --format Spec::Runner::Formatter::TeamcityFormatter --example "Api::V2::TransactionsController#create no-ops if a redemption is already fulfilled"
Testing started at 2:48 PM ...
/usr/local/bundle/gems/rspec-core-3.4.4/lib/rspec/core/configuration.rb:1295:in `require': cannot load such file -- teamcity/spec/runner/formatter/teamcity/formatter (LoadError)