To make PR reviews easier I recently built a little Telegram bot: GitHub - FliegendeWurst/nixpkgs-pr-build-bot: Self-hosted ofborg-like bot for nixpkgs
It functions similarly to ofborg, building all packages mentioned in commit messages.
Using /full <num>, it builds all changed packages (similar to nixpkgs-review).
If the build fails, you get a nicely-formatted summary with links to the full build logs.
I have a demo instance running, send me a PM if you want to try it out 