What do you as a fail safe when there isnt a flake or nix package for what you need, and you don't have the time or ability to create it?
Here's my particular example. I need the beta version of OpenSCAD, which is only delivered as a flatpak in the beta flatpak channel, which I have tried but have been unsuccessful in doing. I havent even attempted building from source. Only the stable version is in nixpkgs. In this case, what would you do?
And in general, what do you do? Install things using a different package manager, like pip, npm, cargo, etc and manage at the user level? Do you run a VM? Docker? Let me know what your backup plan is on NixOS.
I went a different route, but I might be an idiot. Had problems getting mongodb to work It's not open source, so it's not in the cache. My install wouldn't compile, and it seems I'm no alone in this. I setup kvm (libvirt), installed a debian 12, and installed mongodb. It works. I don't particularly like it this way, but it works. I'll probably move away from Mongo eventually. Until then, I'll just leave it as is.
Usually, like if a python package isn't available, you can do half-nix by using something like python venv, and install everything like normal in venv. Or for rust, you get rustup through nix, but then let rustup do its mutable work, instead of literally managing crates through nix. It's also possible to patch a lot of stuff into a nix shell for inter-op.
I haven't really used nix, but I like what I read about it. I see a lot of critiques around it's limited community, and therefore documentation/support
Unfortunately, I don't know the answer to your question. But if there's a relevant repo for the OS, you might be doing the community a favor by asking in the GitHub repo