Allow OpenSearch Docker image to be pulled from Amazon ECR

[ginkel]

Description

Official OpenSearch Docker images are available off Docker Hub and Amazon ECR (cf. https://opensearch.org/docs/2.4/install-and-configure/install-opensearch/docker/#run-opensearch-in-a-docker-container). This PR adds built-in support for using the ECR-based images.

Issues Resolved

n/a

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[reta]

thanks for pull request @ginkel , please check the official recommendations for image name substitution from Testcontainers: https://www.testcontainers.org/features/image_name_substitution/ (also documented testcontainers/testcontainers-java#4219 and testcontainers/testcontainers-java#3102)

[ginkel]

@reta Thanks for your speedy reply! If you consider a built-in allow-listing of the ECR images inappropriate, feel free to disregard my PR. The reason for creating it was that I was actually surprised having to manually declare the ECR-hosted official image as compatible. That's easy to do, but was somewhat unexpected...

[reta]

Thanks @ginkel , I think the issue is, broadly, to support any Docker repository in a way that is aligned with Testcontainers. I believe we should not take the path of ad-hoc ECR / GCR / ... support.