Standardize FROM statement format in Dockerfiles
Currently, the FROM statements in Dockerfiles are formatted like this: ```docker ARG BASE_REGISTRY=nexus-docker-secure.levelup-nexus.svc.cluster.local:18082 ARG BASE_IMAGE=gitlab/gitlab/gitlab-ruby ARG BASE_TAG=15.2.1 ARG RUBY_IMAGE=${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG} FROM ${RUBY_IMAGE} ``` For DSOP releases, repo1 linter doesn't like the use of the `RUBY_IMAGE` variable so we received a request to modify the release helper script to make all FROM statements look like this for all containers: ```docker FROM ${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG} ``` Doing this has the added side benefit of simplifying the code in the Release Helper script because the [same script function](https://gitlab.com/gitlab-org/build/dsop-scripts/-/blob/master/release-helper.sh?ref_type=heads) can be used for all containers when releasing GitLab to DSOP
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