Add @oleg-nenashev as backer, reference @jenkinsci and @cloudbees as adopters (#4170)

Author: oleg-nenashev

docs/index.md

@@ -139,6 +139,7 @@ A huge thank you to our sponsors:
 * [Pascal Zwick (@pas2al)](https://github.com/pas2al)
 * [Nikita Zhevnitskiy (@zhenik)](https://github.com/zhenik)
 * [Bas Stoker (@bastoker)](https://github.com/bastoker)
+* [Oleg Nenashev (@oleg-nenashev)](https://github.com/oleg-nenashev)
 
 ## Who is using Testcontainers?
 
@@ -173,6 +174,9 @@ A huge thank you to our sponsors:
 * [Trino (formerly Presto SQL)](https://trino.io) - Integration testing all Trino core & connectors, including tests of multi-node deployments and security configurations.
 * Google - Various open source projects: [OpenTelemetry](https://github.com/GoogleCloudPlatform/opentelemetry-operations-java), [Universal Application Tool](https://github.com/seattle-uat/universal-application-tool), [CloudBowl](https://github.com/GoogleCloudPlatform/cloudbowl-microservice-game)
 * [Backbase](https://www.backbase.com/) - Unit, Integration and Acceptance testing for different the databases supported (Oracle, SQL Server, MySQL), the different messaging systems supported (Kafka, Rabbit, AMQ) and other microservices and HTTP mocks.
+* [CloudBees](https://www.cloudbees.com/) - Integration testing of products, including but not limited to database and AWS/Localstack integration testing.
+* [Jenkins](https://www.jenkins.io/) - Integration testing of multiple plugins and the Trilead SSH2 fork maintained by the Jenkins community
+  ([query](https://github.com/search?l=Maven+POM&q=org%3Ajenkinsci+testcontainers&type=Code)).
 
 
 ## License