[ECR] [request]: Increase maximum number of tags per image

**Tell us about your request**
It would be great if the current maximum limit of 1000 tags per image could be increased.

**Which service(s) is this request for?**
ECR

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
In our current setup, we build and push with every green CI build. However, if an image has not changed its digest, the tag will land on previous image digest. We can quickly hit the limit of 1000 tags per image in this way.

**Are you currently working around this issue?**
Bump the image digest when we hit 1000 tags.

Start with the ECR request and its stated 1,000-tags-per-image limit. Review the CI build and image-digest workflow described in the issue, including the workaround of changing the digest at the limit. Done would require an AWS-side decision and implementation to increase the limit.

Written by the indexing model from the issue text.