Comment by GeertJohan

Next.js is very nice. One thing that always strikes a nerve with me though is that it goes against 12 factor. There is no proper way to build once, deploy (with config) multiple times. So either you have to build for each environment, which on kubernetes means building different container images (one for each environment). Or do a full re-build when the container starts, which means slower container startup, but at least you can re-use the container across environments and properly inline environment variables. There's a discussion about this; https://github.com/vercel/next.js/discussions/24010