PoC: Release generation from within `.gitlab-ci.yml`

What does this MR do?

• PoC-Rails: gitlab!20762 (closed)
• PoC-Runner: Here

PoC for gitlab#38352 (closed)

Why was this MR needed?

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Added tests for this feature/bug
• In case of conflicts with master - branch was rebased

What are the relevant issue numbers?