Add integration tests

[npepinpe]

We currently have very little testing going on, except those provided by menski (:muscle:)

It shouldn't be too difficult to add integration tests using TestContainers, and it would greatly help to ensure other people can easily contribute to this.

[bsideup]

FYI: I love coffee and/or beer and live in Berlin 😋

[ChrisKujawa]

Probably we should buy @bsideup a drink 😀 thanks for bringing testcontainers up @npepinpe It is quite nice to test the csharp client as well 👍 I'm finally able to write integration tests for the c# client. https://github.com/zeebe-io/zeebe-client-csharp/blob/master/Client.IntegrationTests/BrokerTest.cs

[bsideup]

Would be happy to share some knowledge and discuss issues (if you have / had any)

(and also want to hear your Atomix story too!)