chore(ci): Add SOURCE_REPO env

[universal-itengineer]

Description

Add SOURCE_REPO. It is git repo prefix for building 3-rd party images.

Why do we need it, and what problem does it solve?

For easy creation of third-party images depending on the environment

Checklist

• [ ] The code is covered by unit tests.
• [ ] e2e tests passed.
• [ ] Documentation updated according to the changes.
• [ ] Changes were tested in the Kubernetes cluster manually.