Slow Docker-based Db2JobRepositoryIntegrationTests due to emulation

[fmbenhassine]

This issue is to find the best way to test DB2 job repository support without impacting the build performance due to the following warning:

[INFO] Running org.springframework.batch.core.test.repository.Db2JobRepositoryIntegrationTests
[main] INFO tc.icr.io/db2_community/db2:11.5.9.0 - Creating container for image: icr.io/db2_community/db2:11.5.9.0
[main] INFO org.testcontainers.utility.RegistryAuthLocator - Credential helper/store (docker-credential-desktop) does not have credentials for icr.io
[main] INFO tc.icr.io/db2_community/db2:11.5.9.0 - Container icr.io/db2_community/db2:11.5.9.0 is starting: c1ec17e0e6a8a3c1f14086528b766bd3bbd2695e3ed3fb36e9ad8168437c7739
[main] WARN tc.icr.io/db2_community/db2:11.5.9.0 - The architecture 'amd64' for image 'icr.io/db2_community/db2:11.5.9.0' (ID sha256:dee45baf523a6261bc8837574f37568b0f81c727d36f2076cd89d94b31deda8e) does not match the Docker server architecture 'arm64'. This will cause the container to execute much more slowly due to emulation and may lead to timeout failures.