This reverts [commit](cd1ec7216b), as an alternative fix has already been introduced in PR [#8547](https://github.com/ElementsProject/lightning/pull/8547) to restore reproducible builds.
This reversion is necessary because otherwise Docker image building will fail with GitHub Actions or via build-release.sh. The issue arises from Cargo’s inability to resolve the git URL dependencies for clnrest’s utoipa and utoipa-swagger-ui packages within these build contexts. While direct `docker buildx` commands succeeds, Github Action or build-release.sh modifies the build context in a way that prevents Cargo from locating the specific git commit for these dependencies.
References:
https://github.com/ElementsProject/lightning/pull/8530#issuecomment-3248713576
https://github.com/ElementsProject/lightning/actions/runs/17435823432
Added fixed SOURCE_DATE_EPOCH flag for reproducible ubuntu builds [8547](https://github.com/ElementsProject/lightning/pull/8547)
Changelog-None.