* Use build root tag compatible with oc 4.16 (and below)
For reference, the following command was used to list all the image
tags:
```
skopeo list-tags docker://registry.ci.openshift.org/openshift/release
```
* Update README.md for build root image
* Adding our own base image to test on Openshift CI
Signed-off-by: Mohammed Zeeshan Ahmed <mohammed.zee1000@gmail.com>
* Adding docs and updating base image