Docker Image Tags

I am working with James for the first time and am attempting to build my own image (single node with some custom mailets) using the jpa-app compose file<https://github.com/apache/james-project/blob/3.8.x/server/apps/jpa-app/docker-compose.yml> in 3.8 as a reference. The compose file references the apache/james:jpa-latest as a base image but I am unable to tie this image tag back to a tag in GitHub nor find a Dockerfile to see how it was built. I see tags such as jpa-3.7.2 but again no explicit tie to a git tag, just a suggestive image tag name (even though I assume this image was built from the james-project-3.7.2 branch).

How can I know which git tag jpa-latest was built from?
How can I know explicitly which git tag jpa-3.*.* was built from?
Am I able to see the Dockerfile for jpa-latest (this would be really helpful if Iwanted to compile from src and create a custom image)?

Thanks in advance for any help.


Garrett Singletary