Create XDMoD images with commit hash

We use a date-time stamp in the image names to distinguish the latest and old builds and only keep the five latest builds. When using a common project space to build images there is a risk of building on an older commit hash (eg. a commit from previous week to test a regression in code base). If we run more than 5 builds around that commit point during the tests, we now have five latest builds that are not built on latest HEAD and there is a risk of other downstream projects like deploy pipelines or even a developer considering them to be latest and stable builds.

So inorder to solve this problem we proposed an idea to use commit hashes in the image name vs date-time stamps. We still have to decide the merit of using either one or may be put one of these in the tags (like a commit hash in the name and date in the tags or vice-versa) to differentiate the latest builds.