Update README.md

Add information and example on com.exasol.dockerdb.image system property to usage section.
exasol · Oct 24, 2023 · 1a69c87 · 1a69c87
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@@ -49,6 +49,8 @@ Usually you generate the `testConfig.json` using the Terraform module [terraform
 
 You can also select a specific test-setup in code. For that simply replace `new ExasolTestSetupFactory().getTestSetup()` by `new ExasolTestcontainerTestSetup()`.
 
+To change the Exasol Docker DB version being used you can define the 'com.exasol.dockerdb.image' system property,  e.g: 'mvn verify -Dcom.exasol.dockerdb.image=${{ matrix.docker_db_version }}'.
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 ## Information for Users of This Library
 
 * [Guide for Setting up a Project With Cloud Resources](doc/user_guide/setup_project_with_cloud_resources.md)