init compatibility with: nix bundle, nix run, lib.getExe #306
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This makes all devshells compatible with `lib.getExe`, `nix run`and `nix bundle` by setting `meta.mainProgram` and creating an executable under `$out/bin/${meta.mainProgram}`
Also remove the now unnecessary flakeApp workaround from the docs and replace it with updated instructions.
My main motivation behind this is to create portable executable devshells via `nix bundle`.
For example, to bundle the devShell of devshell itself into a static executable:
```sh
nix bundle --bundler github:DavHau/nix-portable github:numtide/devshell#devShells.x86_64-linux.default
```
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This makes all devshells compatible with
lib.getExe,nix runandnix bundleby settingmeta.mainProgramand creating an executable under$out/bin/${meta.mainProgram}Also remove the now unnecessary flakeApp workaround from the docs and replace it with updated instructions.
My main motivation behind this is to create portable executable devshells via
nix bundle.For example, to bundle the devShell of devshell itself into a static executable: