Define the data directory where tests are storing their data

We use io.debezium:debezium-core:xx (and io.debezium:debezium-core:xx:tests) in our projects which are builded by Gradle.

If I run gradle test the ${projectDir}/target directory is created (we use in tests io.debezium.util.Testing.Files#createTestingXX methods).

In order for the gradle test to create the build/data directory (not target/data) in the project directory I would like to define the environment variable DBZ_TEST_DATA_DIR to specify directory where tests are storing their data.

If value of the DBZ_TEST_DATA_DIR environment variable is undefined then the default value must be used: target/data.