implement apps as fallback or not at all

[blaggacao]

https://github.com/nrdxp/nixflk/blob/d0fe508da20695bd72c1a5eebd3cb113778366ac/flake.nix#L88-L104

nix run falls back to inspecting the self.packages attribute set.

app declarations are only needed when in packages.<system>.<pname> and /bin/<name> and are not euqal, for example:

packages.<system>.coreutils
but:
/bin/cat

It appears to me for the sake of simplicity, the app generation could be dropped. Those naming conflicts are extremely rare and the user could probably declare apps manually in such cases.

[blaggacao]

I think I'll avoid implementing apps in numtide/flake-utils#18 for the time being.

[nrdxp]

Since the filtering of apps requires building the package to test for bin dir, your probably right.