Adds a flake.nix definition to enable building ud3tn and python tools on
NixOS as well as provide a reproducible development environment for
developers.
Unfortunately nix flake doesn't like git submodules by default, because
they add implicit dependencies which are not managed by nix. To work
around this issue submodule support needs to be enables by adding
`?submodules=1` to all nix commands.
Common commands are:
- Build & run ud3tn:
`nix run '.?submodules=1'`
- Build individual packages:
- `nix build '.?submodules=1#ud3tn'
- `nix build '.?submodules=1#py3tn'
- `nix build '.?submodules=1#python-ud3tn-utils'
- Load a development environment with all packages and dependencies:
`nix develop '.?submodules=1'`
Signed-off-by: Maximilian Nitsch <maximilian.nitsch@d3tn.com>
