Modify the upstream PR builds in https://github.com/redhat-developer/rhdh-operator to become hermetic. This will necessitate migrating the `rpms.lock.yaml` from the gitlab repository into the upstream.

Refer to https://github.com/hermetoproject/hermeto/blob/main/docs/gomod.md for building hermetic cache for go packages.

Also reference https://github.com/redhat-developer/rhdh/blob/main/.github/actions/docker-build/action.yaml for an example of how it's being done in the https://github.com/redhat-developer/rhdh repository.